Authorization bypass through user-controlled key in Wekan - CVE-2026-55234
Published: July 28, 2026
Vulnerability identifier: #VU139854
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-55234
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: wekan.github.io
Affected software:
Wekan
Wekan
Detailed vulnerability description
The vulnerability allows a remote user to modify data in a private board they are not a member of.
The vulnerability exists due to improper access control in the DDP update allow rules for cards, lists, and swimlanes when processing update requests that change the boardId field. A remote user can send a specially crafted DDP update request to modify data in a private board they are not a member of.
The issue affects the auto-generated Meteor collection methods for cards, lists, and swimlanes over the websocket interface, and the destination board membership is not validated during these updates.
How to mitigate CVE-2026-55234
Install security update from vendor's website.