CVE-2026-90579 cheshire-cat-ai Cheshire Cat AI custom_auth_handler.py _authorize_http_key missing authentication
Attackers can bypass authentication in Cheshire Cat AI by manipulating the user_id argument in the HTTP key authorization function.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-90579?
CVE-2026-90579 is a medium-severity missing authorization vulnerability in cheshire-cat-ai Cheshire Cat AI, published on 13 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability has been found in cheshire-cat-ai Cheshire Cat AI up to 1.9.2. This affects the function _authorize_http_key of the file core/cat/factory/custom_auth_handler.py. The manipulation of the argument user_id leads to missing authentication. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Which versions are affected by CVE-2026-90579?
How do I fix CVE-2026-90579?
No fix has been published for CVE-2026-90579 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-90579 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90579 exists.
Sources
Also known as GHSA-p5wp-72mx-m2f4.