CVE-2026-68561 PUBLISHED

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

Assigner: GitHub_M
Reserved: 30.07.2026 Published: 19.08.2026 Updated: 19.08.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 8.8

Product Status

Vendor wekan
Product wekan
Versions
  • Version < 9.89 is affected

References

Problem Types

  • CWE-269: Improper Privilege Management CWE
  • CWE-863: Incorrect Authorization CWE