Plane is an open-source project management tool. Prior to 1.4.0, WorkspaceOwnerPermission does not require is_active=True when checking whether a user is a workspace owner. A deactivated user can therefore remain authorized as the workspace owner and retain owner-level access. This issue is fixed in 1.4.0.
https://github.com/makeplane/plane/security/advisories/GHSA-wjgv-cq7w-258v
https://github.com/makeplane/plane/releases/tag/v1.4.0
https://github.com/makeplane/plane/pull/9290
https://github.com/makeplane/plane/commit/6c9dbb50434d16ea00a00d1574723dfd0c3d2446