CVE-2026-105633

Plane is an open-source project management tool. Prior to 1.4.0, the V2 issue-attachment PATCH endpoint accepts issue_id in the URL but omits it from the database query. A project member can use an issue_id they control in the URL while targeting another user's attachment by its pk UUID. Because the server matches only pk, workspace, and project_id, it modifies the attachment regardless of the issue_id in the URL. When the attachment is pending and has not been confirmed as uploaded, the PATCH handler sets created_by = request.user and transfers attachment ownership to the attacker. This issue is fixed in 1.4.0.

• https://github.com/makeplane/plane/commit/5829f0febf0739494d576b60d4943d10d236bc96
• https://github.com/makeplane/plane/pull/9315
• https://github.com/makeplane/plane/releases/tag/v1.4.0
• https://github.com/makeplane/plane/security/advisories/GHSA-5mxw-g5mw-3v3w
• https://github.com/makeplane/plane/security/advisories/GHSA-5mxw-g5mw-3v3w