CVE-2026-104955

Plane is an open-source project management tool. Prior to 1.4.0, a Project Member with role 15 can send a PATCH request to the project-member update endpoint at /api/workspaces/{workspace_slug}/projects/{project_id}/members/{member_pk}/ to change another user's project role. The role-update logic blocks only a new role higher than the requester's role, so assigning the equal Member role bypasses the insufficient validation and promotes a Project Guest with role 5 to Member without Project Admin approval. This unauthorized promotion grants the guest the additional project capabilities associated with the Member role and allows a regular member to bypass project governance controls. This issue is fixed in 1.4.0.

• https://github.com/makeplane/plane/commit/4c1bdd1d625fa3f1141e8af9c15423946472069e
• https://github.com/makeplane/plane/pull/9014
• https://github.com/makeplane/plane/releases/tag/v1.4.0
• https://github.com/makeplane/plane/security/advisories/GHSA-x63v-p7wc-47x4
• https://github.com/makeplane/plane/security/advisories/GHSA-x63v-p7wc-47x4