diff --git a/.changeset/sour-ligers-hunt.md b/.changeset/sour-ligers-hunt.md
new file mode 100644
index 0000000000..5642494c24
--- /dev/null
+++ b/.changeset/sour-ligers-hunt.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-auth-backend': patch
+---
+
+Added `experimentalExtraAllowedOrigins` to config
diff --git a/plugins/auth-backend/config.d.ts b/plugins/auth-backend/config.d.ts
index 25cd8d88ec..4c8430b33f 100644
--- a/plugins/auth-backend/config.d.ts
+++ b/plugins/auth-backend/config.d.ts
@@ -191,5 +191,9 @@ export interface Config {
        */
       backstageTokenExpiration?: HumanDuration;
     };
+    /**
+     * Additional app origins to allow for authenticating
+     */
+    experimentalExtraAllowedOrigins?: string[];
   };
 }