# Tor Browser: CORS Missing Allow Origin

**URL:** https://forum.torproject.org/t/tor-browser-cors-missing-allow-origin/22141
**Category:** Tor Browser Desktop
**Tags:** tor-browser
**Created:** [September 16, 2026, 2:33pm UTC](https://forum.torproject.org/t/tor-browser-cors-missing-allow-origin/22141 "2026-09-16T14:33:19Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![toroid](https://forum.torproject.org/letter_avatar_proxy/v4/letter/t/d26b3c/32.png) [@toroid](https://forum.torproject.org/u/toroid)
#### Post date: [September 16, 2026, 2:33pm UTC](https://forum.torproject.org/t/tor-browser-cors-missing-allow-origin/22141/1 "2026-09-16T14:33:19Z")

</div>

Hello,

I have been running Qubes-Whonix and Tor Browser for 2-3 years, (TB for more).

Recently I noticed I am unable to login at some websites that do CORS requests like:

**Main website** (where login form shows): foo. **com**  
**Login website** (where the main site sends an XHR for login): login.foo. **net**

**Note the different TLD for the login website!**

This same login works fine in regular clearnet Firefox but I am willing to stay anonymous, as my account was registered anonymously before this host separation.

Looking at browser console I see:

```auto
Response body is not available to scripts (Reason: CORS Missing Allow Origin)

```

What is the workaround for this?  
Some setting allowing CORS?