diff --git a/workspaces/netlify-cms-auth/src/callback.ts b/workspaces/netlify-cms-auth/src/callback.ts
index 3c4023aa50..80155e9d2b 100644
--- a/workspaces/netlify-cms-auth/src/callback.ts
+++ b/workspaces/netlify-cms-auth/src/callback.ts
@@ -62,8 +62,7 @@ function postMessageHTML({ status, data }: PostMessageHTMLArgs) {
         const allowedOrigin = (
           message.origin === 'http://localhost:1234' ||
           message.origin === 'http://127.0.0.1:1234' ||
-          message.origin === 'https://0745c69e.starknet-netlify-cms-byd.pages.dev' ||
-          /^https:\\/\\/[-_\\w]+\\.starknet-netlify-cms\\.pages\\.dev$/.test(message.origin)
+          /^https:\\\\/\\\\/[-_\\\\w]+\\\\.starknet-netlify-cms\\\\.pages\\\\.dev$/.test(message.origin)
         );
 
         if (!allowedOrigin) return;