diff --git a/addons/google_recaptcha/static/src/js/recaptcha.js b/addons/google_recaptcha/static/src/js/recaptcha.js
index 7d5153215c5..6ac81a13322 100644
--- a/addons/google_recaptcha/static/src/js/recaptcha.js
+++ b/addons/google_recaptcha/static/src/js/recaptcha.js
@@ -21,7 +21,7 @@ const ReCaptcha = Class.extend({
      */
     loadLibs: function () {
         if (this._publicKey) {
-            this._recaptchaReady = loadJS(`https://www.recaptcha.net/recaptcha/api.js?render=${this._publicKey}`)
+            this._recaptchaReady = loadJS(`https://www.recaptcha.net/recaptcha/api.js?render=${encodeURIComponent(this._publicKey)}`)
                 .then(() => new Promise(resolve => window.grecaptcha.ready(() => resolve())));
             return this._recaptchaReady.then(() => !!document.querySelector('.grecaptcha-badge'));
         }
diff --git a/addons/web_editor/static/shapes/convert.js b/addons/web_editor/static/shapes/convert.js
index 2688f4aa86d..7a556a5f28d 100644
--- a/addons/web_editor/static/shapes/convert.js
+++ b/addons/web_editor/static/shapes/convert.js
@@ -48,14 +48,14 @@ files.filter(f => f.endsWith('svg')).forEach(filePath => {
         repeatX: fileName.includes('repeatx'),
         repeatY: fileName.includes('repeaty'),
     };
-    shape.optionXML = `<we-button data-shape="web_editor/${shape.page}/${shape.name}" data-select-label="${shape.page} ${shape.name}"/>`;
+    shape.optionXML = `<we-button data-shape="web_editor/${encodeURIComponent(shape.page)}/${encodeURIComponent(shape.name)}" data-select-label="${shape.page} ${shape.name}"/>`;
     if (shape.position[0] === 'stretch') {
         shape.position = ['center'];
         shape.size = '100% 100%';
     } else {
         shape.size = '100% auto';
     }
-    shape.scss = `'${shape.page}/${shape.name}': ('position': ${shape.position[0]}, 'size': ${shape.size}, 'colors': (${shape.colors.join(', ')})${shape.repeatX ? ", 'repeat-x': true" : ""}${shape.repeatY ? ", 'repeat-y': true" : ""})`;
+    shape.scss = `'${encodeURIComponent(shape.page)}/${encodeURIComponent(shape.name)}': ('position': ${shape.position[0]}, 'size': ${shape.size}, 'colors': (${shape.colors.join(', ')})${shape.repeatX ? ", 'repeat-x': true" : ""}${shape.repeatY ? ", 'repeat-y': true" : ""})`;
     shapes.push(shape);
 });
 const xml = shapes.map(shape => shape.optionXML).join('\n');
diff --git a/addons/web_editor/static/src/components/media_dialog/document_selector.js b/addons/web_editor/static/src/components/media_dialog/document_selector.js
index a8c84d61ec0..707e6baf3d7 100644
--- a/addons/web_editor/static/src/components/media_dialog/document_selector.js
+++ b/addons/web_editor/static/src/components/media_dialog/document_selector.js
@@ -49,7 +49,7 @@ export class DocumentSelector extends FileSelector {
     static async createElements(selectedMedia, { orm }) {
         return Promise.all(selectedMedia.map(async attachment => {
             const linkEl = document.createElement('a');
-            let href = `/web/content/${attachment.id}?unique=${attachment.checksum}&download=true`;
+            let href = `/web/content/${encodeURIComponent(attachment.id)}?unique=${encodeURIComponent(attachment.checksum)}&download=true`;
             if (!attachment.public) {
                 let accessToken = attachment.access_token;
                 if (!accessToken) {
@@ -59,7 +59,7 @@ export class DocumentSelector extends FileSelector {
                         [attachment.id],
                     );
                 }
-                href += `&access_token=${accessToken}`;
+                href += `&access_token=${encodeURIComponent(accessToken)}`;
             }
             linkEl.href = href;
             linkEl.title = attachment.name;
diff --git a/addons/web_editor/static/src/components/media_dialog/file_selector.js b/addons/web_editor/static/src/components/media_dialog/file_selector.js
index e13fb71a8b8..3fec0d99b14 100644
--- a/addons/web_editor/static/src/components/media_dialog/file_selector.js
+++ b/addons/web_editor/static/src/components/media_dialog/file_selector.js
@@ -40,7 +40,7 @@ AttachmentError.template = xml `
             following pages or views:</p>
         <ul t-foreach="props.views"  t-as="view" t-key="view.id">
             <li>
-                <a t-att-href="'/web#model=ir.ui.view&amp;id=' + view.id">
+                <a t-att-href="'/web#model=ir.ui.view&amp;id=' + window.encodeURIComponent(view.id)">
                     <t t-esc="view.name"/>
                 </a>
             </li>
diff --git a/addons/web_editor/static/src/components/media_dialog/image_selector.js b/addons/web_editor/static/src/components/media_dialog/image_selector.js
index 4726a4ab802..0cf76da6438 100644
--- a/addons/web_editor/static/src/components/media_dialog/image_selector.js
+++ b/addons/web_editor/static/src/components/media_dialog/image_selector.js
@@ -272,7 +272,7 @@ export class ImageSelector extends FileSelector {
                         [attachment.id],
                     );
                 }
-                src += `?access_token=${accessToken}`;
+                src += `?access_token=${encodeURIComponent(accessToken)}`;
             }
             imageEl.src = src;
             imageEl.alt = attachment.description || '';
diff --git a/addons/web_editor/static/src/components/media_dialog/video_selector.js b/addons/web_editor/static/src/components/media_dialog/video_selector.js
index 8704f8d9ac1..e6088583b79 100644
--- a/addons/web_editor/static/src/components/media_dialog/video_selector.js
+++ b/addons/web_editor/static/src/components/media_dialog/video_selector.js
@@ -89,11 +89,11 @@ export class VideoSelector extends Component {
 
         onMounted(async () => {
             await Promise.all(this.props.vimeoPreviewIds.map(async (videoId) => {
-                const { thumbnail_url: thumbnailSrc } = await this.http.get(`https://vimeo.com/api/oembed.json?url=http%3A//vimeo.com/${videoId}`);
+                const { thumbnail_url: thumbnailSrc } = await this.http.get(`https://vimeo.com/api/oembed.json?url=http%3A//vimeo.com/${encodeURIComponent(videoId)}`);
                 this.state.vimeoPreviews.push({
                     id: videoId,
                     thumbnailSrc,
-                    src: `https://player.vimeo.com/video/${videoId}`
+                    src: `https://player.vimeo.com/video/${encodeURIComponent(videoId)}`
                 });
             }));
         });
diff --git a/addons/web_editor/static/src/js/backend/convert_inline.js b/addons/web_editor/static/src/js/backend/convert_inline.js
index 8f602d793a2..2d11ead61c8 100644
--- a/addons/web_editor/static/src/js/backend/convert_inline.js
+++ b/addons/web_editor/static/src/js/backend/convert_inline.js
@@ -721,7 +721,7 @@ function fontToImg($editable) {
             const image = document.createElement('img');
             image.setAttribute('width', intrinsicWidth);
             image.setAttribute('height', intrinsicHeight);
-            image.setAttribute('src', `/web_editor/font_to_img/${content.charCodeAt(0)}/${window.encodeURI(color)}/${window.encodeURI(bg)}/${Math.max(1, Math.round(intrinsicWidth))}x${Math.max(1, Math.round(intrinsicHeight))}`);
+            image.setAttribute('src', `/web_editor/font_to_img/${content.charCodeAt(0)}/${encodeURIComponent(color)}/${encodeURIComponent(bg)}/${Math.max(1, Math.round(intrinsicWidth))}x${Math.max(1, Math.round(intrinsicHeight))}`);
             image.setAttribute('data-class', font.getAttribute('class'));
             image.setAttribute('data-style', style);
             image.setAttribute('style', style);
diff --git a/addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js b/addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js
index 8a7d6d04d2b..0cf80615eb4 100644
--- a/addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js
+++ b/addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js
@@ -4397,7 +4397,7 @@ export class OdooEditor extends EventTarget {
                                     videoElement.setAttribute('height', '315');
                                     videoElement.setAttribute(
                                         'src',
-                                        `https://www.youtube.com/embed/${youtubeUrl[1]}`,
+                                        `https://www.youtube.com/embed/${encodeURIComponent(youtubeUrl[1])}`,
                                     );
                                     videoElement.setAttribute('title', 'YouTube video player');
                                     videoElement.setAttribute('frameborder', '0');
diff --git a/addons/web_editor/static/src/js/editor/snippets.editor.js b/addons/web_editor/static/src/js/editor/snippets.editor.js
index a7ee7bb6cc1..c80c5dd48cf 100644
--- a/addons/web_editor/static/src/js/editor/snippets.editor.js
+++ b/addons/web_editor/static/src/js/editor/snippets.editor.js
@@ -3751,7 +3751,7 @@ var SnippetsMenu = Widget.extend({
             $content: $('<div/>', {text: sprintf(_t("Do you want to install the %s App?"), name)}).append(
                 $('<a/>', {
                     target: '_blank',
-                    href: '/web#id=' + moduleID + '&view_type=form&model=ir.module.module&action=base.open_module_tree',
+                    href: '/web#id=' + encodeURIComponent(moduleID) + '&view_type=form&model=ir.module.module&action=base.open_module_tree',
                     text: _t("More info about this app."),
                     class: 'ml4',
                 })
diff --git a/addons/web_editor/static/src/js/editor/snippets.options.js b/addons/web_editor/static/src/js/editor/snippets.options.js
index 35af113e60b..7beae559547 100644
--- a/addons/web_editor/static/src/js/editor/snippets.options.js
+++ b/addons/web_editor/static/src/js/editor/snippets.options.js
@@ -6128,7 +6128,7 @@ registry.ImageTools = ImageHandlerOption.extend({
         const [module, directory, fileName] = shapeName.split('/');
         let shape = this.shapeCache[fileName];
         if (!shape) {
-            const shapeURL = `/${module}/static/image_shapes/${directory}/${fileName}.svg`;
+            const shapeURL = `/${encodeURIComponent(module)}/static/image_shapes/${encodeURIComponent(directory)}/${encodeURIComponent(fileName)}.svg`;
             shape = await (await fetch(shapeURL)).text();
             this.shapeCache[fileName] = shape;
         }
@@ -6334,7 +6334,7 @@ registry.ImageTools = ImageHandlerOption.extend({
         uiFragment.querySelectorAll('we-select-page we-button[data-set-img-shape]').forEach(btn => {
             const image = document.createElement('img');
             const [moduleName, directory, shapeName] = btn.dataset.setImgShape.split('/');
-            image.src = `/${moduleName}/static/image_shapes/${directory}/${shapeName}.svg`;
+            image.src = `/${encodeURIComponent(moduleName)}/static/image_shapes/${encodeURIComponent(directory)}/${encodeURIComponent(shapeName)}.svg`;
             $(btn).prepend(image);
 
             if (btn.dataset.animated) {
@@ -6411,7 +6411,7 @@ registry.ImageTools = ImageHandlerOption.extend({
                 // attribute.
                 match = match.slice(0, -12);
             }
-            return this._loadImageInfo(`/web/image/${match}`);
+            return this._loadImageInfo(`/web/image/${encodeURIComponent(match)}`);
         }
         return _super(...arguments);
     },
@@ -7163,9 +7163,9 @@ registry.BackgroundShape = SnippetOptionWidget.extend({
                 return `${colorName}=${encodedCol}`;
             });
         if (flip.length) {
-            searchParams.push(`flip=${flip.sort().join('')}`);
+            searchParams.push(`flip=${encodeURIComponent(flip.sort().join(''))}`);
         }
-        return `/web_editor/shape/${shape}.svg?${searchParams.join('&')}`;
+        return `/web_editor/shape/${encodeURIComponent(shape)}.svg?${searchParams.join('&')}`;
     },
     /**
      * Retrieves current shape data from the target's dataset.
diff --git a/addons/web_editor/static/src/js/wysiwyg/widgets/link_popover_widget.js b/addons/web_editor/static/src/js/wysiwyg/widgets/link_popover_widget.js
index 0de5cfb9d4b..424e3311025 100644
--- a/addons/web_editor/static/src/js/wysiwyg/widgets/link_popover_widget.js
+++ b/addons/web_editor/static/src/js/wysiwyg/widgets/link_popover_widget.js
@@ -209,7 +209,7 @@ const LinkPopoverWidget = Widget.extend({
             // would need to fetch the page through the server (s2s), involving
             // enduser fetching problematic pages such as illicit content.
             this.$previewFaviconImg.attr({
-                'src': `https://www.google.com/s2/favicons?sz=16&domain=${url}`
+                'src': `https://www.google.com/s2/favicons?sz=16&domain=${encodeURIComponent(url)}`
             }).removeClass('d-none');
             this.$previewFaviconFa.addClass('d-none');
         } else {
diff --git a/addons/web_editor/static/src/js/wysiwyg/wysiwyg.js b/addons/web_editor/static/src/js/wysiwyg/wysiwyg.js
index 320d9738bce..0852d3e673c 100644
--- a/addons/web_editor/static/src/js/wysiwyg/wysiwyg.js
+++ b/addons/web_editor/static/src/js/wysiwyg/wysiwyg.js
@@ -219,7 +219,7 @@ const Wysiwyg = Widget.extend({
             categories: powerboxOptions.categories,
             plugins: options.editorPlugins,
             direction: options.direction || localization.direction || 'ltr',
-            collaborationClientAvatarUrl: `${browser.location.origin}/web/image?model=res.users&field=avatar_128&id=${this.getSession().uid}`,
+            collaborationClientAvatarUrl: `${browser.location.origin}/web/image?model=res.users&field=avatar_128&id=${encodeURIComponent(this.getSession().uid)}`,
             renderingClasses: ['o_dirty', 'o_transform_removal', 'oe_edited_link', 'o_menu_loading'],
             dropImageAsAttachment: options.dropImageAsAttachment,
             foldSnippets: !!options.foldSnippets,
@@ -503,7 +503,7 @@ const Wysiwyg = Widget.extend({
                         }
                         return this._userName;
                     },
-                    get_client_avatar: () => `${browser.location.origin}/web/image?model=res.users&field=avatar_128&id=${this.getSession().uid}`,
+                    get_client_avatar: () => `${browser.location.origin}/web/image?model=res.users&field=avatar_128&id=${encodeURIComponent(this.getSession().uid)}`,
                     get_missing_steps: (params) => this.odooEditor.historyGetMissingSteps(params.requestPayload),
                     get_history_from_snapshot: () => this.odooEditor.historyGetSnapshotSteps(),
                     get_collaborative_selection: () => this.odooEditor.getCurrentCollaborativeSelection(),
@@ -964,7 +964,7 @@ const Wysiwyg = Widget.extend({
                 // it was modified previously, as the other modified image may be used
                 // elsewhere if the snippet was duplicated or was saved as a custom one.
                 const newAttachmentSrc = await this._rpc({
-                    route: `/web_editor/modify_image/${el.dataset.originalId}`,
+                    route: `/web_editor/modify_image/${encodeURIComponent(el.dataset.originalId)}`,
                     params: {
                         res_model: resModel,
                         res_id: parseInt(resId),
diff --git a/addons/website/static/src/client_actions/configurator/configurator.js b/addons/website/static/src/client_actions/configurator/configurator.js
index c62521e5aae..c7bb7df59f6 100644
--- a/addons/website/static/src/client_actions/configurator/configurator.js
+++ b/addons/website/static/src/client_actions/configurator/configurator.js
@@ -372,7 +372,7 @@ class ApplyConfiguratorScreen extends Component {
             // Here the website service goToWebsite method is not used because
             // the web client needs to be reloaded after the new modules have
             // been installed.
-            window.location.replace(`/web#action=website.website_preview&website_id=${resp.website_id}&enable_editor=1&with_loader=1`);
+            window.location.replace(`/web#action=website.website_preview&website_id=${encodeURIComponent(resp.website_id)}&enable_editor=1&with_loader=1`);
         }
     }
 }
@@ -634,7 +634,7 @@ export class Configurator extends Component {
     }
 
     get pathname() {
-        return `/website/configurator${this.state.currentStep ? `/${this.state.currentStep}` : ''}`;
+        return `/website/configurator${this.state.currentStep ? `/${encodeURIComponent(this.state.currentStep)}` : ''}`;
     }
 
     get storageItemName() {
diff --git a/addons/website/static/src/client_actions/website_preview/website_preview.js b/addons/website/static/src/client_actions/website_preview/website_preview.js
index da5c9631e3a..9e83357cedc 100644
--- a/addons/website/static/src/client_actions/website_preview/website_preview.js
+++ b/addons/website/static/src/client_actions/website_preview/website_preview.js
@@ -65,9 +65,9 @@ export class WebsitePreview extends Component {
                 // URL (event if it wasn't, it wouldn't be an issue as those are
                 // really considered as the same domain, the user will share the
                 // same session and CORS errors won't be a thing in such a case)
-                window.location.href = `${this.websiteDomain}/web#action=website.website_preview&path=${encodedPath}&website_id=${this.websiteId}`;
+                window.location.href = `${encodeURI(this.websiteDomain)}/web#action=website.website_preview&path=${encodedPath}&website_id=${encodeURIComponent(this.websiteId)}`;
             } else {
-                this.initialUrl = `/website/force/${this.websiteId}?path=${encodedPath}`;
+                this.initialUrl = `/website/force/${encodeURIComponent(this.websiteId)}?path=${encodedPath}`;
             }
         });
 
diff --git a/addons/website/static/src/components/dialog/seo.js b/addons/website/static/src/components/dialog/seo.js
index a89b586dd04..da690aad728 100644
--- a/addons/website/static/src/components/dialog/seo.js
+++ b/addons/website/static/src/components/dialog/seo.js
@@ -29,7 +29,7 @@ class ImageSelector extends Component {
         this.seoContext = useState(seoContext);
 
         const firstImageId = this.props.hasSocialDefaultImage ? 'social_default_image' : 'logo';
-        const firstImageSrc = `/web/image/website/${this.website.currentWebsite.id}/${firstImageId}`;
+        const firstImageSrc = `/web/image/website/${encodeURIComponent(this.website.currentWebsite.id)}/${firstImageId}`;
         const firstImage = {
             src: firstImageSrc,
             active: this.areSameImages(firstImageSrc, this.seoContext.metaImage),
diff --git a/addons/website/static/src/components/wysiwyg_adapter/wysiwyg_adapter.js b/addons/website/static/src/components/wysiwyg_adapter/wysiwyg_adapter.js
index 2070b1ea9a6..02f4d30a51b 100644
--- a/addons/website/static/src/components/wysiwyg_adapter/wysiwyg_adapter.js
+++ b/addons/website/static/src/components/wysiwyg_adapter/wysiwyg_adapter.js
@@ -696,7 +696,7 @@ export class WysiwygAdapterComponent extends ComponentAdapter {
         } else if (event.data.reloadWebClient) {
             const currentPath = encodeURIComponent(window.location.pathname);
             const websiteId = this.websiteService.currentWebsite.id;
-            callback = () => window.location = `/web#action=website.website_preview&website_id=${websiteId}&path=${currentPath}&enable_editor=1`;
+            callback = () => window.location = `/web#action=website.website_preview&website_id=${encodeURIComponent(websiteId)}&path=${currentPath}&enable_editor=1`;
         } else if (event.data.action) {
             callback = () => {
                 this.leaveEditMode({
diff --git a/addons/website/static/src/js/backend/dashboard.js b/addons/website/static/src/js/backend/dashboard.js
index f55ef0ed248..ce1f42c870c 100644
--- a/addons/website/static/src/js/backend/dashboard.js
+++ b/addons/website/static/src/js/backend/dashboard.js
@@ -103,7 +103,7 @@ var Dashboard = AbstractAction.extend({
     on_go_to_website: function (ev) {
         ev.preventDefault();
         var website = this.websites.find(website => website.selected);
-        window.location.replace(`/web#action=website.website_preview&website_id=${website.id}`);
+        window.location.replace(`/web#action=website.website_preview&website_id=${encodeURIComponent(website.id)}`);
     },
 
 
diff --git a/addons/website/static/src/js/content/website_root.js b/addons/website/static/src/js/content/website_root.js
index 2093628d9ce..b07848a726a 100644
--- a/addons/website/static/src/js/content/website_root.js
+++ b/addons/website/static/src/js/content/website_root.js
@@ -141,7 +141,7 @@ export const WebsiteRoot = publicRootData.PublicRoot.extend(KeyboardNavigationMi
                     this._gmapAPILoading = false;
                     return;
                 }
-                await loadJS(`https://maps.googleapis.com/maps/api/js?v=3.exp&libraries=places&callback=odoo_gmap_api_post_load&key=${key}`);
+                await loadJS(`https://maps.googleapis.com/maps/api/js?v=3.exp&libraries=places&callback=odoo_gmap_api_post_load&key=${encodeURIComponent(key)}`);
             });
         }
         return this._gmapAPILoading;
@@ -173,7 +173,7 @@ export const WebsiteRoot = publicRootData.PublicRoot.extend(KeyboardNavigationMi
         var $target = $(ev.currentTarget);
         // retrieve the hash before the redirect
         var redirect = {
-            lang: $target.data('url_code'),
+            lang: encodeURIComponent($target.data('url_code')),
             url: encodeURIComponent($target.attr('href').replace(/[&?]edit_translations[^&?]+/, '')),
             hash: encodeURIComponent(window.location.hash)
         };
diff --git a/addons/website/static/src/js/editor/snippets.editor.js b/addons/website/static/src/js/editor/snippets.editor.js
index 2096557c49b..efc0b7d01db 100644
--- a/addons/website/static/src/js/editor/snippets.editor.js
+++ b/addons/website/static/src/js/editor/snippets.editor.js
@@ -169,7 +169,7 @@ const wSnippetMenu = weSnippetEditor.SnippetsMenu.extend({
      */
     async _validateGMapAPIKey(key) {
         try {
-            const response = await fetch(`https://maps.googleapis.com/maps/api/staticmap?center=belgium&size=10x10&key=${key}`);
+            const response = await fetch(`https://maps.googleapis.com/maps/api/staticmap?center=belgium&size=10x10&key=${encodeURIComponent(key)}`);
             const isValid = (response.status === 200);
             return {
                 isValid: isValid,
diff --git a/addons/website/static/src/js/editor/snippets.options.js b/addons/website/static/src/js/editor/snippets.options.js
index 2670d072e97..3b659de8672 100644
--- a/addons/website/static/src/js/editor/snippets.options.js
+++ b/addons/website/static/src/js/editor/snippets.options.js
@@ -128,7 +128,7 @@ const FontFamilyPickerUserValueWidget = SelectUserValueWidget.extend({
         }
         for (const font of this.googleLocalFonts) {
             const attachmentId = font.split(/\s*:\s*/)[1];
-            const fontURL = `/web/content/${attachmentId}`;
+            const fontURL = `/web/content/${encodeURIComponent(attachmentId)}`;
             fontsToLoad.push(fontURL);
         }
         // TODO ideally, remove the <link> elements created once this widget
@@ -233,7 +233,9 @@ const FontFamilyPickerUserValueWidget = SelectUserValueWidget.extend({
                         let isValidFamily = false;
 
                         try {
-                            const result = await fetch("https://fonts.googleapis.com/css?family=" + m[1]+':300,300i,400,400i,700,700i', {method: 'HEAD'});
+                            // Font family is an encoded query parameter:
+                            // "Open+Sans" needs to remain "Open+Sans".
+                            const result = await fetch("https://fonts.googleapis.com/css?family=" + m[1] + ':300,300i,400,400i,700,700i', {method: 'HEAD'});
                             // Google fonts server returns a 400 status code if family is not valid.
                             if (result.ok) {
                                 isValidFamily = true;
@@ -1627,7 +1629,7 @@ options.registry.company_data = options.Class.extend({
                     args: [session.uid, ['company_id']],
                 });
             }).then(function (res) {
-                proto.__link = '/web#action=base.action_res_company_form&view_type=form&id=' + (res && res[0] && res[0].company_id[0] || 1);
+                proto.__link = '/web#action=base.action_res_company_form&view_type=form&id=' + encodeURIComponent(res && res[0] && res[0].company_id[0] || 1);
             });
         }
         return Promise.all([this._super.apply(this, arguments), prom]);
diff --git a/addons/website/static/src/services/website_service.js b/addons/website/static/src/services/website_service.js
index 3a45e287391..77dfadbd130 100644
--- a/addons/website/static/src/services/website_service.js
+++ b/addons/website/static/src/services/website_service.js
@@ -193,7 +193,7 @@ export const websiteService = {
                 this.websiteRootInstance = undefined;
                 if (lang) {
                     invalidateSnippetCache = true;
-                    path = `/website/lang/${lang}?r=${encodeURIComponent(path)}`;
+                    path = `/website/lang/${encodeURIComponent(lang)}?r=${encodeURIComponent(path)}`;
                 }
                 action.doAction('website.website_preview', {
                     clearBreadcrumbs: true,
diff --git a/addons/website/static/src/snippets/s_social_media/options.js b/addons/website/static/src/snippets/s_social_media/options.js
index c90cb256a37..462a6a568f8 100644
--- a/addons/website/static/src/snippets/s_social_media/options.js
+++ b/addons/website/static/src/snippets/s_social_media/options.js
@@ -128,7 +128,7 @@ options.registry.SocialMedia = options.Class.extend({
                     const faIcon = isDbField ? `fa-${entry.media}` : 'fa-pencil';
                     anchorEl.querySelector('i').classList.add(faIcon);
                     if (isDbField) {
-                        anchorEl.href = `/website/social/${entry.media}`;
+                        anchorEl.href = `/website/social/${encodeURIComponent(entry.media)}`;
                         anchorEl.classList.add(`s_social_media_${entry.media}`);
                     }
                 }
@@ -199,7 +199,7 @@ options.registry.SocialMedia = options.Class.extend({
             return {
                 id: generateHTMLId(),
                 display_name: media ? dbSocialValues[`social_${media}`] : el.getAttribute('href'),
-                placeholder: `https://${media || 'example'}.com/yourPage`,
+                placeholder: `https://${encodeURIComponent(media) || 'example'}.com/yourPage`,
                 undeletable: !!media,
                 notToggleable: !media,
                 selected: true,
@@ -211,13 +211,13 @@ options.registry.SocialMedia = options.Class.extend({
         // Adds the DB social media links that are not in the DOM.
         for (let [media, link] of Object.entries(dbSocialValues)) {
             media = media.split('social_').pop();
-            if (!this.$target[0].querySelector(`:scope > a[href="/website/social/${media}"]`)) {
+            if (!this.$target[0].querySelector(`:scope > a[href="/website/social/${encodeURIComponent(media)}"]`)) {
                 const entryNotInDom = this.entriesNotInDom.find(entry => entry.media === media);
                 if (!entryNotInDom) {
                     this.entriesNotInDom.push({
                         id: generateHTMLId(),
                         display_name: link,
-                        placeholder: `https://${media}.com/yourPage`,
+                        placeholder: `https://${encodeURIComponent(media)}.com/yourPage`,
                         undeletable: true,
                         selected: false,
                         listPosition: listPosition++,
diff --git a/addons/website/static/src/snippets/s_website_form/options.js b/addons/website/static/src/snippets/s_website_form/options.js
index 60cb4ce065d..702cef32461 100644
--- a/addons/website/static/src/snippets/s_website_form/options.js
+++ b/addons/website/static/src/snippets/s_website_form/options.js
@@ -770,7 +770,7 @@ options.registry.WebsiteFormEditor = FormEditor.extend({
      * @param {string} action
      */
     _redirectToAction: function (action) {
-        window.location.replace(`/web#action=${action}`);
+        window.location.replace(`/web#action=${encodeURIComponent(action)}`);
     },
 
     //--------------------------------------------------------------------------
diff --git a/addons/website/static/src/systray_items/website_switcher.js b/addons/website/static/src/systray_items/website_switcher.js
index 3283c26f263..e18a2023fc7 100644
--- a/addons/website/static/src/systray_items/website_switcher.js
+++ b/addons/website/static/src/systray_items/website_switcher.js
@@ -21,7 +21,7 @@ export class WebsiteSwitcherSystray extends Component {
                 if (website.domain && !wUtils.isHTTPSorNakedDomainRedirection(website.domain, window.location.origin)) {
                     const { location: { pathname, search, hash } } = this.websiteService.contentWindow;
                     const path = pathname + search + hash;
-                    window.location.href = `${website.domain}/web#action=website.website_preview&path=${encodeURI(path)}&website_id=${website.id}`;
+                    window.location.href = `${encodeURI(website.domain)}/web#action=website.website_preview&path=${encodeURIComponent(path)}&website_id=${encodeURIComponent(website.id)}`;
                 } else {
                     this.websiteService.goToWebsite({ websiteId: website.id });
                 }
diff --git a/addons/website_blog/static/src/js/website_blog.js b/addons/website_blog/static/src/js/website_blog.js
index 8fd216e0e13..82c0a6f913d 100644
--- a/addons/website_blog/static/src/js/website_blog.js
+++ b/addons/website_blog/static/src/js/website_blog.js
@@ -70,16 +70,16 @@ publicWidget.registry.websiteBlog = publicWidget.Widget.extend({
         ev.preventDefault();
         var url = '';
         var $element = $(ev.currentTarget);
-        var blogPostTitle = encodeURIComponent($('#o_wblog_post_name').html() || '');
-        var articleURL = encodeURIComponent(window.location.href);
+        var blogPostTitle = $('#o_wblog_post_name').html() || '';
+        var articleURL = window.location.href;
         if ($element.hasClass('o_twitter')) {
             var twitterText = core._t("Amazing blog article: %s! Check it live: %s");
             var tweetText = _.string.sprintf(twitterText, blogPostTitle, articleURL);
-            url = 'https://twitter.com/intent/tweet?tw_p=tweetbutton&text=' + tweetText;
+            url = 'https://twitter.com/intent/tweet?tw_p=tweetbutton&text=' + encodeURIComponent(tweetText);
         } else if ($element.hasClass('o_facebook')) {
-            url = 'https://www.facebook.com/sharer/sharer.php?u=' + articleURL;
+            url = 'https://www.facebook.com/sharer/sharer.php?u=' + encodeURIComponent(articleURL);
         } else if ($element.hasClass('o_linkedin')) {
-            url = 'https://www.linkedin.com/sharing/share-offsite/?url=' + articleURL;
+            url = 'https://www.linkedin.com/sharing/share-offsite/?url=' + encodeURIComponent(articleURL);
         }
         window.open(url, '', 'menubar=no, width=500, height=400');
     },
diff --git a/addons/website_event_booth/static/src/js/booth_register.js b/addons/website_event_booth/static/src/js/booth_register.js
index af7c5dfc8ec..3d6f0c7136f 100644
--- a/addons/website_event_booth/static/src/js/booth_register.js
+++ b/addons/website_event_booth/static/src/js/booth_register.js
@@ -204,7 +204,7 @@ publicWidget.registry.boothRegistration = publicWidget.Widget.extend({
         if (this._isConfirmationFormValid($form)) {
             const formData = new FormData($form[0]);
             const response = await $.ajax({
-                url: `/event/${this.$el.data('eventId')}/booth/confirm`,
+                url: `/event/${encodeURIComponent(this.$el.data('eventId'))}/booth/confirm`,
                 data: formData,
                 processData: false,
                 contentType: false,
diff --git a/addons/website_event_exhibitor/static/src/js/event_exhibitor_connect.js b/addons/website_event_exhibitor/static/src/js/event_exhibitor_connect.js
index 519981ae31d..da0a7e40d89 100644
--- a/addons/website_event_exhibitor/static/src/js/event_exhibitor_connect.js
+++ b/addons/website_event_exhibitor/static/src/js/event_exhibitor_connect.js
@@ -47,7 +47,7 @@ var ExhibitorConnectClosedDialog = Dialog.extend({
      */
     async _fetchSponsor() {
         const sponsorData = await this._rpc({
-            route: `/event_sponsor/${this.sponsorId}/read`
+            route: `/event_sponsor/${encodeURIComponent(this.sponsorId)}/read`
         });
         sponsorData.website_description = Markup(sponsorData.website_description);
         this.sponsorData = sponsorData;
diff --git a/addons/website_event_track/static/src/js/website_event_track_proposal_form.js b/addons/website_event_track/static/src/js/website_event_track_proposal_form.js
index ebe7558792c..d30a7cc9b62 100644
--- a/addons/website_event_track/static/src/js/website_event_track_proposal_form.js
+++ b/addons/website_event_track/static/src/js/website_event_track_proposal_form.js
@@ -171,7 +171,7 @@ publicWidget.registry.websiteEventTrackProposalForm = publicWidget.Widget.extend
             const formData = new FormData(this.$el[0]);
 
             const response = await $.ajax({
-                url: `/event/${this.$el.data('eventId')}/track_proposal/post`,
+                url: `/event/${encodeURIComponent(this.$el.data('eventId'))}/track_proposal/post`,
                 data: formData,
                 processData: false,
                 contentType: false,
diff --git a/addons/website_forum/static/src/js/systray_items/forum_forum_add_form.js b/addons/website_forum/static/src/js/systray_items/forum_forum_add_form.js
index a1c992ab405..5c362badc6f 100644
--- a/addons/website_forum/static/src/js/systray_items/forum_forum_add_form.js
+++ b/addons/website_forum/static/src/js/systray_items/forum_forum_add_form.js
@@ -8,7 +8,7 @@ export class AddForumFormController extends NewContentFormController {
      * @override
      */
     computePath() {
-        return `/forum/${this.model.root.data.id}`;
+        return `/forum/${encodeURIComponent(this.model.root.data.id)}`;
     }
 }
 
diff --git a/addons/website_forum/static/src/js/website_forum.js b/addons/website_forum/static/src/js/website_forum.js
index fe1c3560f1d..486075c874a 100644
--- a/addons/website_forum/static/src/js/website_forum.js
+++ b/addons/website_forum/static/src/js/website_forum.js
@@ -47,7 +47,7 @@ publicWidget.registry.websiteForum = publicWidget.Widget.extend({
         // welcome message action button
         var forumLogin = _.string.sprintf('%s/web?redirect=%s',
             window.location.origin,
-            escape(window.location.href)
+            encodeURIComponent(window.location.href)
         );
         $('.forum_register_url').attr('href', forumLogin);
 
@@ -252,7 +252,7 @@ publicWidget.registry.websiteForum = publicWidget.Widget.extend({
                 const linkLabel = _t("Read the guidelines to know how to gain karma.");
                 notifOptions.message = Markup`
                     ${notifOptions.message}<br/>
-                    <a class="alert-link" href="/forum/${forumID}/faq">${linkLabel}</a>
+                    <a class="alert-link" href="/forum/${encodeURIComponent(forumID)}/faq">${linkLabel}</a>
                 `;
             }
         }
diff --git a/addons/website_jitsi/static/src/js/chat_room.js b/addons/website_jitsi/static/src/js/chat_room.js
index 52ccb0ac471..dc821c189d2 100644
--- a/addons/website_jitsi/static/src/js/chat_room.js
+++ b/addons/website_jitsi/static/src/js/chat_room.js
@@ -230,7 +230,7 @@ publicWidget.registry.ChatRoom = publicWidget.Widget.extend({
     _openMobileApplication: async function (roomName) {
         if (config.device.isMobile) {
             // we are on mobile, open the room in the application
-            window.location = `intent://${this.jitsiServer}/${roomName}#Intent;scheme=org.jitsi.meet;package=org.jitsi.meet;end`;
+            window.location = `intent://${this.jitsiServer}/${encodeURIComponent(roomName)}#Intent;scheme=org.jitsi.meet;package=org.jitsi.meet;end`;
             return true;
         }
         return false;
diff --git a/addons/website_livechat/static/src/core/persona_model_patch.js b/addons/website_livechat/static/src/core/persona_model_patch.js
index 1b9d026f9e9..f98a61c382e 100644
--- a/addons/website_livechat/static/src/core/persona_model_patch.js
+++ b/addons/website_livechat/static/src/core/persona_model_patch.js
@@ -7,7 +7,7 @@ patch(Persona.prototype, "website_livechat", {
     get countryFlagUrl() {
         const country = this.partner?.country ?? this.country;
         return country
-            ? `/base/static/img/country_flags/${country.code.toLowerCase()}.png`
+            ? `/base/static/img/country_flags/${encodeURIComponent(country.code.toLowerCase())}.png`
             : undefined;
     },
     get nameOrDisplayName() {
diff --git a/addons/website_livechat/static/src/core/thread_service_patch.js b/addons/website_livechat/static/src/core/thread_service_patch.js
index 4b36cd364e2..eddc265bd2d 100644
--- a/addons/website_livechat/static/src/core/thread_service_patch.js
+++ b/addons/website_livechat/static/src/core/thread_service_patch.js
@@ -21,7 +21,7 @@ patch(ThreadService.prototype, "website_livechat", {
     avatarUrl(persona, thread) {
         if (persona?.type === "visitor" && thread?.id) {
             return persona.partner
-                ? `/mail/channel/${thread.id}/partner/${persona.id}/avatar_128`
+                ? `/mail/channel/${encodeURIComponent(thread.id)}/partner/${encodeURIComponent(persona.id)}/avatar_128`
                 : DEFAULT_AVATAR;
         }
         return this._super(persona, thread);
diff --git a/addons/website_sale_comparison/static/src/js/website_sale_comparison.js b/addons/website_sale_comparison/static/src/js/website_sale_comparison.js
index 999d8297054..80dc892e936 100644
--- a/addons/website_sale_comparison/static/src/js/website_sale_comparison.js
+++ b/addons/website_sale_comparison/static/src/js/website_sale_comparison.js
@@ -67,8 +67,8 @@ var ProductComparison = publicWidget.Widget.extend(VariantMixin, {
         $(document.body).on('click.product_comparaison_widget', '.o_comparelist_remove', function (ev) {
             self._removeFromComparelist(ev);
             self.guard.exec(function() {
-                var new_link = '/shop/compare?products=' + self.comparelist_product_ids.toString();
-                window.location.href = _.isEmpty(self.comparelist_product_ids) ? '/shop' : new_link;
+                const newLink = '/shop/compare?products=' + encodeURIComponent(self.comparelist_product_ids);
+                window.location.href = _.isEmpty(self.comparelist_product_ids) ? '/shop' : newLink;
             });
         });
 
@@ -240,7 +240,8 @@ var ProductComparison = publicWidget.Widget.extend(VariantMixin, {
             this.$('.o_comparelist_products').addClass('d-md-block');
             if (this.comparelist_product_ids.length >=2) {
                 this.$('.o_comparelist_button').addClass('d-md-block');
-                this.$('.o_comparelist_button a').attr('href', '/shop/compare?products='+this.comparelist_product_ids.toString());
+                this.$('.o_comparelist_button a').attr('href',
+                    '/shop/compare?products=' + encodeURIComponent(this.comparelist_product_ids));
             }
         }
     },
diff --git a/addons/website_slides/static/src/js/slides_course_fullscreen_player.js b/addons/website_slides/static/src/js/slides_course_fullscreen_player.js
index e1bfcf25abb..50ca540a39e 100644
--- a/addons/website_slides/static/src/js/slides_course_fullscreen_player.js
+++ b/addons/website_slides/static/src/js/slides_course_fullscreen_player.js
@@ -609,7 +609,7 @@
                 } else if (slideData.category === 'video' && slideData.videoSourceType === 'vimeo') {
                     slideData.embedCode = Markup(slideData.embedCode);
                 } else if (slideData.category === 'infographic') {
-                    slideData.embedUrl = `/web/image/slide.slide/${slideData.id}/image_1024`;
+                    slideData.embedUrl = `/web/image/slide.slide/${encodeURIComponent(slideData.id)}/image_1024`;
                 } else if (slideData.category === 'document') {
                     slideData.embedUrl = $(slideData.embedCode).attr('src');
                 }
diff --git a/addons/website_slides/static/src/js/slides_course_join.js b/addons/website_slides/static/src/js/slides_course_join.js
index ab0bf8f4cf9..1f7b5acc11e 100644
--- a/addons/website_slides/static/src/js/slides_course_join.js
+++ b/addons/website_slides/static/src/js/slides_course_join.js
@@ -74,7 +74,7 @@ var CourseJoinWidget = publicWidget.Widget.extend({
                 url += '?fullscreen=1';
             }
         } else {
-            url = `/slides/${this.channel.channelId}`;
+            url = `/slides/${encodeURIComponent(this.channel.channelId)}`;
         }
         document.location = sprintf('/web/login?redirect=%s', encodeURIComponent(url));
     },
@@ -119,7 +119,7 @@ var CourseJoinWidget = publicWidget.Widget.extend({
                     const message = data.error_signup_allowed ?
                         _t('Please <a href="/web/login?redirect=%s">login</a> or <a href="/web/signup?redirect=%s">create an account</a> to join this course') :
                         _t('Please <a href="/web/login?redirect=%s">login</a> to join this course');
-                    self._popoverAlert(self.$el, sprintf(message, document.URL, document.URL));
+                    self._popoverAlert(self.$el, sprintf(message, encodeURIComponent(document.URL), encodeURIComponent(document.URL)));
                 } else if (data.error === 'join_done') {
                     self._popoverAlert(self.$el, _t('You have already joined this channel'));
                 } else {
diff --git a/addons/website_slides/static/src/js/slides_course_quiz.js b/addons/website_slides/static/src/js/slides_course_quiz.js
index 8b7f8a1291a..6d503a16e6c 100644
--- a/addons/website_slides/static/src/js/slides_course_quiz.js
+++ b/addons/website_slides/static/src/js/slides_course_quiz.js
@@ -791,7 +791,7 @@
                     .text(_t('Mark To Do'))
                     .removeAttr('title')
                     .removeAttr('aria-disabled')
-                    .attr('href', `/slides/slide/${slide.id}/set_uncompleted`);
+                    .attr('href', `/slides/slide/${encodeURIComponent(slide.id)}/set_uncompleted`);
             }
         },
 
diff --git a/addons/website_slides/static/src/js/slides_slide_like.js b/addons/website_slides/static/src/js/slides_slide_like.js
index f129a62ea8b..a6d64cd26ab 100644
--- a/addons/website_slides/static/src/js/slides_slide_like.js
+++ b/addons/website_slides/static/src/js/slides_slide_like.js
@@ -70,7 +70,7 @@ var SlideLikeWidget = publicWidget.Widget.extend({
                     const message = data.error_signup_allowed ?
                         _t('Please <a href="/web/login?redirect=%s">login</a> or <a href="/web/signup?redirect=%s">create an account</a> to vote for this lesson') :
                         _t('Please <a href="/web/login?redirect=%s">login</a> to vote for this lesson');
-                    self._popoverAlert(self.$el, sprintf(message, document.URL, document.URL));
+                    self._popoverAlert(self.$el, sprintf(message, encodeURIComponent(document.URL), encodeURIComponent(document.URL)));
                 } else if (data.error === 'slide_access') {
                     self._popoverAlert(self.$el, _t('You don\'t have access to this lesson'));
                 } else if (data.error === 'channel_membership_required') {
diff --git a/addons/website_twitter/static/src/js/website.twitter.animation.js b/addons/website_twitter/static/src/js/website.twitter.animation.js
index d54e69029ca..5176a3ce40b 100644
--- a/addons/website_twitter/static/src/js/website.twitter.animation.js
+++ b/addons/website_twitter/static/src/js/website.twitter.animation.js
@@ -62,7 +62,7 @@ publicWidget.registry.twitter = publicWidget.Widget.extend({
                     .replace(
                         /[#]+[A-Za-z0-9_]+/g,
                         function (hashtag) {
-                            return _makeLink('http://twitter.com/search?q='+hashtag.replace('#',''), hashtag);
+                            return _makeLink('http://twitter.com/search?q=' + encodeURIComponent(hashtag.replace('#', '')), hashtag);
                         }
                     ));