{"id":"CVE-2026-105633","published":"2026-10-05T18:17:36.757","lastModified":"2026-10-05T19:17:17.213","description":"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.","cvssScore":7.1,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L","cwes":["CWE-639"],"vendors":[],"products":[],"references":[{"url":"https://github.com/makeplane/plane/commit/5829f0febf0739494d576b60d4943d10d236bc96","tags":[]},{"url":"https://github.com/makeplane/plane/pull/9315","tags":[]},{"url":"https://github.com/makeplane/plane/releases/tag/v1.4.0","tags":[]},{"url":"https://github.com/makeplane/plane/security/advisories/GHSA-5mxw-g5mw-3v3w","tags":[]},{"url":"https://github.com/makeplane/plane/security/advisories/GHSA-5mxw-g5mw-3v3w","tags":[]}],"exploitRefs":[{"url":"https://github.com/makeplane/plane/commit/5829f0febf0739494d576b60d4943d10d236bc96","tags":[]},{"url":"https://github.com/makeplane/plane/pull/9315","tags":[]},{"url":"https://github.com/makeplane/plane/releases/tag/v1.4.0","tags":[]},{"url":"https://github.com/makeplane/plane/security/advisories/GHSA-5mxw-g5mw-3v3w","tags":[]},{"url":"https://github.com/makeplane/plane/security/advisories/GHSA-5mxw-g5mw-3v3w","tags":[]}],"hasPoc":true,"ai":null}