CVE-2026-22660 FlaskBB Logic Flaw Authorization Group Deletion via Bulk AJAX Endpoint
Authenticated administrators can delete built-in authorization groups due to a type mismatch, destroying the permission model and rendering the forum unusable.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-22660?
CVE-2026-22660 is a high-severity vulnerability in flaskbb, published on 10 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
FlaskBB through 2.2.0, fixed in commit a5da9a5, contains a logic flaw vulnerability that allows authenticated administrators to delete all built-in authorization groups by exploiting a type mismatch in the bulk delete protection check. The bulk AJAX endpoint in the management views compares received JSON integer group IDs against string literals, causing the protection check to always pass, which allows deletion of all six built-in groups and destroys the forum's permission model, potentially rendering the site unusable.
Weakness: CWE-697
Which versions are affected by CVE-2026-22660?
How do I fix CVE-2026-22660?
No fix has been published for CVE-2026-22660 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-22660 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-22660 exists.
Sources
Also known as GHSA-r9cf-jxr6-5h3r.