Executive brief
WeKan is an open-source Kanban board application used for task management and project organization. A security flaw in versions prior to 8.19 allows users who should only have "read-only" access to a board to bypass restrictions and modify cards or labels. This could lead to unauthorized changes in project data, task status, or organizational workflows by users who are not supposed to have editing privileges.
Technical details
An incorrect authorization vulnerability (CWE-863) exists in the WeKan API. The root cause is that certain API endpoints, such as those for updating labels or cards (e.g., PUT /api/boards/:boardId/labels), were using a check for general board access (checkBoardAccess) instead of verifying write permissions (checkBoardWriteAccess). A remote attacker with low-privileged, read-only credentials can exploit this by sending crafted API requests to modify board content. The issue is resolved in WeKan version 8.19 by implementing stricter access control checks in the server-side Meteor code.
Affected products
- WeKan WeKan versions prior to 8.19
Timeline
- 2025-12-29: patched: Fix commit 181f837d8cbae96bdf9dcbd31beaa3653c2c0285 pushed to GitHub.
- 2026-02-07: disclosed: Initial publication of CVE-2026-25565.