Incorrect authorization in Wekan - #VU139848
Published: July 28, 2026
Vulnerability identifier: #VU139848
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-863
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 escalate privileges and take over a private board.
The vulnerability exists due to incorrect authorization in the Boards.update allow rule for sort updates in server/permissions/boards.js and canUpdateBoardSort in server/lib/utils.js when handling crafted DDP board update requests that modify the sort field together with other board fields. A remote user can send a specially crafted DDP update request to escalate privileges and take over a private board.
The issue affects authenticated users who are already active members of the target board, including comment-only or read-only members, and can also expose a private board by changing its permission to public.
Remediation
Install security update from vendor's website.