CVE-2026-68561 Privilege escalation in wekan
A low-privilege Wekan board member can escalate to board admin and take over a private board by exploiting a flawed authorization rule in the sort collection update logic.
- 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-2026-68561?
CVE-2026-68561 is a high-severity vulnerability in wekan, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Wekan is open source kanban built with Meteor. Prior to 9.89, the second Boards.allow({ update }) rule in server/permissions/boards.js called canUpdateBoardSort in server/lib/utils.js, which authorized any board member whenever fieldNames included sort. Because Meteor combines allow rules with OR semantics and applies the complete modifier, a comment-only or read-only member could send one Boards.update with $set values for sort, members, permission, and title, make themselves the sole board administrator, expose a private board, and evict the legitimate owner; the last-admin deny rule inspected only $pull and did not block a wholesale $set of members. Version 9.89 requires sort to be the only modified field and rejects $set member arrays that remove the last active administrator. This issue is fixed in version 9.89.
Which versions are affected by CVE-2026-68561?
How do I fix CVE-2026-68561?
No fix has been published for CVE-2026-68561 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-68561 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-68561 exists.
Sources
Also known as GHSA-xm8x-c8wg-jhmf.