diff --git a/src/core/features/course/components/module-summary/module-summary.html b/src/core/features/course/components/module-summary/module-summary.html
index 64cb80e6d..202d5ad12 100644
--- a/src/core/features/course/components/module-summary/module-summary.html
+++ b/src/core/features/course/components/module-summary/module-summary.html
@@ -81,7 +81,8 @@
                             </ion-badge>
                         </ion-label>
                         <ion-icon *ngIf="grade.icon" name="{{grade.icon}}" slot="end" [attr.aria-label]="grade.iconAlt" />
-                        <img *ngIf="grade.image && !grade.itemmodule" [src]="grade.image" slot="end" [alt]="grade.iconAlt" />
+                        <img *ngIf="grade.image && !grade.itemmodule" [src]="grade.image" slot="end" [alt]="grade.iconAlt"
+                            core-external-content />
                         <ion-icon *ngIf="grade.image && grade.itemmodule" name="fas-chart-bar" slot="end"
                             [attr.aria-label]="grade.iconAlt" />
                     </ion-item>
diff --git a/src/core/features/grades/pages/course/course.html b/src/core/features/grades/pages/course/course.html
index 1627cddd7..93cb0270d 100644
--- a/src/core/features/grades/pages/course/course.html
+++ b/src/core/features/grades/pages/course/course.html
@@ -43,7 +43,7 @@
                                         class="expandable-status-icon" [class.expandable-status-icon-expanded]="row.expanded" />
                                     <ion-icon *ngIf="row.icon" name="{{row.icon}}" slot="start" [attr.aria-label]="row.iconAlt" />
                                     <img *ngIf="row.image && !row.itemmodule" [src]="row.image" slot="start" class="core-module-icon"
-                                        [alt]="row.iconAlt" />
+                                        [alt]="row.iconAlt" core-external-content />
                                     <core-mod-icon *ngIf="row.image && row.itemmodule" [modicon]="row.image" slot="start"
                                         [modname]="row.itemmodule" [colorize]="false" />
                                     <span [innerHTML]="row.gradeitem"></span>
diff --git a/src/core/features/login/pages/reconnect/reconnect.html b/src/core/features/login/pages/reconnect/reconnect.html
index bab706356..354a1a9b3 100644
--- a/src/core/features/login/pages/reconnect/reconnect.html
+++ b/src/core/features/login/pages/reconnect/reconnect.html
@@ -33,7 +33,8 @@
                 <div class="core-login-site">
                     <div class="core-login-site-logo" *ngIf="!showUserAvatar">
                         <!-- Show site logo or a default image. -->
-                        <img *ngIf="logoUrl" [src]="logoUrl" role="presentation" onError="this.src='assets/img/login_logo.png'" alt="">
+                        <img *ngIf="logoUrl" [src]="logoUrl" role="presentation" onError="this.src='assets/img/login_logo.png'" alt=""
+                            core-external-content [siteId]="siteId">
                         <img *ngIf="!logoUrl" src="assets/img/login_logo.png" role="presentation" alt="">
                     </div>
 
diff --git a/src/core/features/mainmenu/components/user-menu/user-menu.html b/src/core/features/mainmenu/components/user-menu/user-menu.html
index b45428a55..6dc40ca15 100644
--- a/src/core/features/mainmenu/components/user-menu/user-menu.html
+++ b/src/core/features/mainmenu/components/user-menu/user-menu.html
@@ -21,7 +21,7 @@
                 <ion-label>
                     <!-- Show site logo. -->
                     <img class="core-usermenu-site-logo" *ngIf="siteLogo && siteLogoLoaded" [src]="siteLogo" role="presentation" alt=""
-                        onError="this.class='image-not-found'">
+                        core-external-content onError="this.class='image-not-found'">
                     <p class="core-usermenu-sitename">
                         <core-format-text [text]="siteName" contextLevel="system" [contextInstanceId]="0" [wsNotFiltered]="true" />
                     </p>