CVE-2026-104955 Plane: Project Member can escalate Project Guest to Member via PATCH /project-members/{pk} (BAC / Privilege Escalation)
A project member can improperly promote a guest to member role, bypassing governance controls and gaining unauthorized project capabilities.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104955?
CVE-2026-104955 is a medium-severity vulnerability in makeplane plane, published on 5 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-104955?
How do I fix CVE-2026-104955?
No fix has been published for CVE-2026-104955 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-104955 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104955 exists.
Sources
Also known as GHSA-x63v-p7wc-47x4.