CVE-2026-56774 Kanboard - Cross-User Deletion of Persistent Login Sessions via Unvalidated Session ID
Authenticated users can delete other users' persistent login sessions by manipulating session IDs, causing denial of service and forcing re-authentication.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56774?
CVE-2026-56774 is a medium-severity missing authorization vulnerability in kanboard, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Kanboard through 1.2.52, fixed in commit 928c68a, UserViewController::removeSession fails to validate the session id parameter before passing it to RememberMeSessionModel::remove, allowing authenticated users to delete other users' Remember Me sessions. Attackers can enumerate sequential session IDs and mass-invalidate persistent login sessions of any user, including administrators, forcing re-authentication and causing denial of service.
Weakness: CWE-639
Which versions are affected by CVE-2026-56774?
How do I fix CVE-2026-56774?
No fix has been published for CVE-2026-56774 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-2026-56774 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56774 exists.
Sources
Also known as GHSA-vvjm-mjq4-27c8.