Vulnerability · Published Aug 19, 2026 · Assigned by GitHub_M

CVE-2026-68561Wekan: a low-privilege board member escalates to board admin and takes over a private board via the `sort` collection-allow rule

High 8.8

In plain English

A high-severity privilege mismanagement in wekan from wekan. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.5%top 56.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
wekan	wekan	< 9.89

Weakness: CWE-269, CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

https://github.com/wekan/wekan/security/advisories/GHSA-xm8x-c8wg-jhmf x_refsource_CONFIRM
https://github.com/wekan/wekan/commit/dc135f6e7d59f9f56065cd5df83b1f123ea120bb x_refsource_MISC
https://github.com/wekan/wekan/releases/tag/v9.89 x_refsource_MISC