Executive brief
WeKan is an open-source project management tool used to organize tasks on visual boards. A security flaw in the software's comment system allows a logged-in user to post comments that appear to come from a different user. This could be used to spread misinformation, forge approvals, or damage the reputation of other team members within the platform.
Technical details
An Insecure Direct Object Reference (IDOR) exists in the card comment creation API of WeKan versions prior to 8.19. The vulnerability stems from the API endpoint's reliance on an 'authorId' field provided within the request body without verifying it against the authenticated user's actual session identity. An attacker with valid login credentials can submit a request containing the identifier of another user to attribute a comment to them. This issue is categorized as CWE-639 (Authorization Bypass Through User-Controlled Key) and was addressed in version 8.19 by removing the user-controlled authorId parameter from the API route.
Affected products
- WeKan WeKan < 8.19
Timeline
- 2026-02-07: disclosed
- 2026-02-07: advisory
- 2026-02-07: patched: Fixed in version 8.19