diff --git a/framework/core/js/src/common/Application.tsx b/framework/core/js/src/common/Application.tsx
index 8d0140fde..243afa9bc 100644
--- a/framework/core/js/src/common/Application.tsx
+++ b/framework/core/js/src/common/Application.tsx
@@ -553,7 +553,11 @@ export default class Application {
         break;
 
       default:
-        content = app.translator.trans('core.lib.error.generic_message');
+        if (this.requestWasCrossOrigin(error)) {
+          content = app.translator.trans('core.lib.error.generic_cross_origin_message');
+        } else {
+          content = app.translator.trans('core.lib.error.generic_message');
+        }
     }
 
     const isDebug: boolean = app.forum.attribute('debug');
@@ -577,6 +581,18 @@ export default class Application {
     return Promise.reject(error);
   }
 
+  /**
+   * Used to modify the error message shown on the page to help troubleshooting.
+   * While not certain, a failing cross-origin request likely indicates a missing redirect to Flarum canonical URL.
+   * Because XHR errors do not expose CORS information, we can only compare the requested URL origin to the page origin.
+   *
+   * @param error
+   * @protected
+   */
+  protected requestWasCrossOrigin(error: RequestError): boolean {
+    return new URL(error.options.url, document.baseURI).origin !== window.location.origin;
+  }
+
   protected requestErrorDefaultHandler(e: unknown, isDebug: boolean, formattedErrors: string[]): void {
     if (e instanceof RequestError) {
       if (isDebug && e.xhr) {
diff --git a/framework/core/locale/core.yml b/framework/core/locale/core.yml
index e21745c5a..0d9167f7d 100644
--- a/framework/core/locale/core.yml
+++ b/framework/core/locale/core.yml
@@ -555,6 +555,7 @@ core:
       dependent_extensions_message: "Cannot disable {extension} until the following dependent extensions are disabled: {extensions}"
       extension_initialiation_failed_message: "{extension} failed to initialize, check the browser console for further information."
       generic_message: "Oops! Something went wrong. Please reload the page and try again."
+      generic_cross_origin_message: "Oops! Something went wrong during a cross-origin request. Please reload the page and try again."
       missing_dependencies_message: "Cannot enable {extension} until the following dependencies are enabled: {extensions}"
       not_found_message: The requested resource was not found.
       payload_too_large_message: The request payload was too large.