CVE-2026-105633
highPlane is an open-source project management tool.
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/makeplane/plane/commit/5829f0febf0739494d576b60d4943d10d236bc96 security-advisories@github.com
- https://github.com/makeplane/plane/pull/9315 security-advisories@github.com
- https://github.com/makeplane/plane/releases/tag/v1.4.0 security-advisories@github.com
- https://github.com/makeplane/plane/security/advisories/GHSA-5mxw-g5mw-3v3w security-advisories@github.com
- https://github.com/makeplane/plane/security/advisories/GHSA-5mxw-g5mw-3v3w 134c704f-9b21-4f2e-91b3-4a467353bcc0