CVE-2026-105634

Plane is an open-source project management tool. Prior to 1.3.0, the ProjectMemberViewSet.partial_update method allows any project member, including a user with the lowest GUEST role, to modify another project member's role. The authorization check prevents assigning a role higher than the requester's role but does not prevent assigning a lower or equal role, allowing a Guest to demote Administrators and Members and deny them project control. This vulnerability is fixed in 1.3.0.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

• https://github.com/makeplane/plane/commit/587fe76032fb69275866fdeb655699a70a83c521
• https://github.com/makeplane/plane/pull/8833
• https://github.com/makeplane/plane/releases/tag/v1.3.0
• https://github.com/makeplane/plane/security/advisories/GHSA-494h-3rcq-5g3c