diff --git a/addons/im_livechat/controllers/cors/binary.py b/addons/im_livechat/controllers/cors/binary.py
index 5e55381b66a..66069acd68b 100644
--- a/addons/im_livechat/controllers/cors/binary.py
+++ b/addons/im_livechat/controllers/cors/binary.py
@@ -31,3 +31,25 @@ class LivechatBinaryController(BinaryController):
     def livechat_fetch_image(self, guest_token, channel_id, attachment_id, width=0, height=0, **kwargs):
         force_guest_env(guest_token)
         return self.fetch_image(channel_id, attachment_id, width, height, **kwargs)
+
+    @route(
+        "/im_livechat/cors/channel/<int:channel_id>/partner/<int:partner_id>/avatar_128",
+        methods=["GET"],
+        type="http",
+        auth="public",
+        cors="*",
+    )
+    def livechat_channel_partner_avatar_128(self, guest_token, channel_id, partner_id, **kwargs):
+        force_guest_env(guest_token)
+        return self.discuss_channel_partner_avatar_128(channel_id, partner_id, **kwargs)
+
+    @route(
+        "/im_livechat/cors/channel/<int:channel_id>/guest/<int:guest_id>/avatar_128",
+        methods=["GET"],
+        type="http",
+        auth="public",
+        cors="*",
+    )
+    def livechat_channel_guest_avatar_128(self, guest_token, channel_id, guest_id, **kwargs):
+        force_guest_env(guest_token)
+        return self.discuss_channel_guest_avatar_128(channel_id, guest_id, **kwargs)
diff --git a/addons/im_livechat/static/src/core/thread_model_patch.js b/addons/im_livechat/static/src/core/thread_model_patch.js
index e2c9e41a667..fbea6d3c9ed 100644
--- a/addons/im_livechat/static/src/core/thread_model_patch.js
+++ b/addons/im_livechat/static/src/core/thread_model_patch.js
@@ -1,6 +1,5 @@
 /* @odoo-module */
 
-import { DEFAULT_AVATAR } from "@mail/core/common/persona_service";
 import { Record } from "@mail/core/common/record";
 import { Thread } from "@mail/core/common/thread_model";
 import { assignDefined } from "@mail/utils/common/misc";
@@ -82,9 +81,7 @@ patch(Thread.prototype, {
         if (this.type !== "livechat") {
             return super.imgUrl;
         }
-        return this.correspondent && this.correspondent.type !== "guest"
-            ? `/web/image/res.partner/${this.correspondent.id}/avatar_128`
-            : DEFAULT_AVATAR;
+        return this._store.env.services["mail.thread"].avatarUrl(this.correspondent, this);
     },
 
     /**
diff --git a/addons/im_livechat/static/src/core/thread_service_patch.js b/addons/im_livechat/static/src/core/thread_service_patch.js
index 0f28e463e63..bb493a73b4b 100644
--- a/addons/im_livechat/static/src/core/thread_service_patch.js
+++ b/addons/im_livechat/static/src/core/thread_service_patch.js
@@ -1,6 +1,5 @@
 /* @odoo-module */
 
-import { DEFAULT_AVATAR } from "@mail/core/common/persona_service";
 import { ThreadService } from "@mail/core/common/thread_service";
 
 import { patch } from "@web/core/utils/patch";
@@ -67,15 +66,4 @@ patch(ThreadService.prototype, {
         this.chatWindowService.focus(chatWindow);
         return true;
     },
-
-    /**
-     * @param {import("models").Persona} persona
-     * @param {import("models").Thread} thread
-     */
-    avatarUrl(author, thread) {
-        if (thread?.type === "livechat" && author?.type === "guest") {
-            return DEFAULT_AVATAR;
-        }
-        return super.avatarUrl(author, thread);
-    },
 });
diff --git a/addons/im_livechat/static/src/embed/core/@types/models.d.ts b/addons/im_livechat/static/src/embed/core/@types/models.d.ts
index 2a32d997e96..38d62b77f51 100644
--- a/addons/im_livechat/static/src/embed/core/@types/models.d.ts
+++ b/addons/im_livechat/static/src/embed/core/@types/models.d.ts
@@ -2,5 +2,6 @@ declare module "models" {
     export interface Thread {
         chatbotTypingMessage: Message,
         livechatWelcomeMessage: Message,
+        operator: Persona,
     }
 }
diff --git a/addons/im_livechat/static/src/embed/core/thread_model_patch.js b/addons/im_livechat/static/src/embed/core/thread_model_patch.js
index de9955886ec..25d618ee9e7 100644
--- a/addons/im_livechat/static/src/embed/core/thread_model_patch.js
+++ b/addons/im_livechat/static/src/embed/core/thread_model_patch.js
@@ -60,6 +60,7 @@ patch(Thread.prototype, {
         super.setup();
         this.chatbotTypingMessage = Record.one("Message");
         this.livechatWelcomeMessage = Record.one("Message");
+        this.operator = Record.one("Persona");
     },
     update(data) {
         super.update(...arguments);
diff --git a/addons/im_livechat/static/src/embed/core/thread_service_patch.js b/addons/im_livechat/static/src/embed/core/thread_service_patch.js
index 5580cd74285..29595d252f0 100644
--- a/addons/im_livechat/static/src/embed/core/thread_service_patch.js
+++ b/addons/im_livechat/static/src/embed/core/thread_service_patch.js
@@ -3,7 +3,7 @@
 import { ThreadService, threadService } from "@mail/core/common/thread_service";
 
 import { patch } from "@web/core/utils/patch";
-import { session } from "@web/session";
+import { url } from "@web/core/utils/urls";
 
 threadService.dependencies.push(
     "im_livechat.livechat",
@@ -63,20 +63,10 @@ patch(ThreadService.prototype, {
         }
     },
 
-    avatarUrl(author, thread) {
-        if (thread?.type !== "livechat") {
-            return super.avatarUrl(...arguments);
-        }
-        const isFromOperator =
-            author && author.id !== this.livechatService.options.current_partner_id;
-        if (isFromOperator) {
-            return `${session.origin}/im_livechat/operator/${
-                author?.id ?? thread.operator.id
-            }/avatar`;
-        } else if (author) {
-            return `${session.origin}/web/image/res.partner/${author.id}/avatar_128`;
-        } else {
-            return `${session.origin}/mail/static/src/img/smiley/avatar.jpg`;
+    avatarUrl(persona, thread) {
+        if (thread.type === "livechat" && persona.eq(thread.operator)) {
+            return url(`/im_livechat/operator/${persona.id}/avatar`);
         }
+        return super.avatarUrl(...arguments);
     },
 });
diff --git a/addons/im_livechat/static/src/embed/cors/thread_service_patch.js b/addons/im_livechat/static/src/embed/cors/thread_service_patch.js
new file mode 100644
index 00000000000..40b1da5f873
--- /dev/null
+++ b/addons/im_livechat/static/src/embed/cors/thread_service_patch.js
@@ -0,0 +1,21 @@
+/* @odoo-module */
+
+import { ThreadService } from "@mail/core/common/thread_service";
+
+import { patch } from "@web/core/utils/patch";
+import { url } from "@web/core/utils/urls";
+
+patch(ThreadService.prototype, {
+    avatarUrl(persona, thread) {
+        if (thread?.model === "discuss.channel" && persona.notEq(thread.operator)) {
+            const route =
+                persona.type === "partner"
+                    ? `/im_livechat/cors/channel/${thread.id}/partner/${persona.id}/avatar_128`
+                    : `/im_livechat/cors/channel/${thread.id}/guest/${persona.id}/avatar_128`;
+            return url(route, {
+                guest_token: this.env.services["im_livechat.livechat"].guestToken,
+            });
+        }
+        return super.avatarUrl(...arguments);
+    },
+});
diff --git a/addons/im_livechat/static/tests/sidebar_patch_tests.js b/addons/im_livechat/static/tests/sidebar_patch_tests.js
index 17d28a36af9..1f963bcc4cd 100644
--- a/addons/im_livechat/static/tests/sidebar_patch_tests.js
+++ b/addons/im_livechat/static/tests/sidebar_patch_tests.js
@@ -5,6 +5,7 @@ import { startServer } from "@bus/../tests/helpers/mock_python_environment";
 import { Command } from "@mail/../tests/helpers/command";
 import { start } from "@mail/../tests/helpers/test_utils";
 
+import { url } from "@web/core/utils/urls";
 import { nextTick } from "@web/../tests/helpers/utils";
 import { click, contains } from "@web/../tests/utils";
 
@@ -220,10 +221,10 @@ QUnit.test("Close from the bus", async () => {
     });
 });
 
-QUnit.test("Smiley face avatar for an anonymous livechat item", async () => {
+QUnit.test("Smiley face avatar for livechat item linked to a guest", async () => {
     const pyEnv = await startServer();
     const guestId = pyEnv["mail.guest"].create({ name: "Visitor 11" });
-    pyEnv["discuss.channel"].create({
+    const channelId = pyEnv["discuss.channel"].create({
         anonymous_name: "Visitor 11",
         channel_member_ids: [
             [0, 0, { partner_id: pyEnv.currentPartnerId }],
@@ -235,7 +236,9 @@ QUnit.test("Smiley face avatar for an anonymous livechat item", async () => {
     const { openDiscuss } = await start();
     openDiscuss();
     await contains(
-        ".o-mail-DiscussSidebarCategory-livechat + .o-mail-DiscussSidebarChannel img[data-src='/mail/static/src/img/smiley/avatar.jpg']"
+        `.o-mail-DiscussSidebarCategory-livechat + .o-mail-DiscussSidebarChannel img[data-src='${url(
+            `/discuss/channel/${channelId}/guest/${guestId}/avatar_128`
+        )}']`
     );
 });
 
@@ -253,7 +256,9 @@ QUnit.test("Partner profile picture for livechat item linked to a partner", asyn
     const { openDiscuss } = await start();
     openDiscuss(channelId);
     await contains(
-        `.o-mail-DiscussSidebarCategory-livechat + .o-mail-DiscussSidebarChannel img[data-src='/web/image/res.partner/${partnerId}/avatar_128']`
+        `.o-mail-DiscussSidebarCategory-livechat + .o-mail-DiscussSidebarChannel img[data-src='${url(
+            `/discuss/channel/${channelId}/partner/${partnerId}/avatar_128`
+        )}']`
     );
 });
 
diff --git a/addons/website_livechat/static/src/core_ui/thread_patch.xml b/addons/website_livechat/static/src/core_ui/thread_patch.xml
index 3f0f363581d..fb42fd32255 100644
--- a/addons/website_livechat/static/src/core_ui/thread_patch.xml
+++ b/addons/website_livechat/static/src/core_ui/thread_patch.xml
@@ -5,7 +5,7 @@
             <t t-set="visitor" t-value="props.thread.visitor"/>
             <div t-if="visitor and !env.inChatWindow" class="o-website_livechat-VisitorBanner py-4 px-2 d-flex border-bottom">
                 <div class="o-website_livechat-VisitorBanner-sidebar me-2 d-flex justify-content-center">
-                    <img class="rounded o-website_livechat-VisitorBanner-avatar" t-att-src="threadService.avatarUrl(visitor, props.thread)" alt="Avatar"/>
+                    <img class="rounded o-website_livechat-VisitorBanner-avatar" t-att-src="threadService.avatarUrl(props.thread.correspondent, props.thread)" alt="Avatar"/>
                 </div>
                 <div>
                     <div class="d-flex align-items-baseline">
diff --git a/addons/website_livechat/static/tests/thread_patch_tests.js b/addons/website_livechat/static/tests/thread_patch_tests.js
index 1e7a0ef76e6..d754643d625 100644
--- a/addons/website_livechat/static/tests/thread_patch_tests.js
+++ b/addons/website_livechat/static/tests/thread_patch_tests.js
@@ -5,6 +5,8 @@ import { startServer } from "@bus/../tests/helpers/mock_python_environment";
 import { Command } from "@mail/../tests/helpers/command";
 import { start } from "@mail/../tests/helpers/test_utils";
 
+import { url } from "@web/core/utils/urls";
+
 QUnit.module("thread (patch)");
 
 QUnit.test("Rendering of visitor banner", async (assert) => {
@@ -36,7 +38,9 @@ QUnit.test("Rendering of visitor banner", async (assert) => {
     assert.containsOnce($, "img.o-website_livechat-VisitorBanner-avatar");
     assert.containsOnce(
         $,
-        "img.o-website_livechat-VisitorBanner-avatar[data-src='/mail/static/src/img/smiley/avatar.jpg']"
+        `img.o-website_livechat-VisitorBanner-avatar[data-src='${url(
+            `/discuss/channel/${channelId}/guest/${guestId}/avatar_128`
+        )}']`
     );
     assert.containsOnce($, ".o-website_livechat-VisitorBanner .o-mail-ImStatus");
     assert.containsOnce($, ".o_country_flag[data-src='/base/static/img/country_flags/be.png']");