CVE-2026-104964 Plane: Cross-Workspace Project Modification via Unscoped Project Lookup
An administrator in one workspace can modify projects in another workspace by exploiting unscoped project lookups, violating tenant isolation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104964?
CVE-2026-104964 is a medium-severity missing authorization vulnerability in makeplane plane, published on 5 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Plane is an open-source project management tool. Prior to 1.4.0, Plane's project update endpoint authorizes the caller against the workspace slug in the request URL but loads the target project globally by UUID without binding it to that workspace. An administrator of one workspace can modify a project in another workspace when the victim project UUID is known. This violates tenant isolation and permits unauthorized cross-workspace changes to project metadata and configuration. This issue is fixed in 1.4.0.
Weakness: CWE-639
Which versions are affected by CVE-2026-104964?
How do I fix CVE-2026-104964?
No fix has been published for CVE-2026-104964 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-104964 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104964 exists.
Sources
Also known as GHSA-pp22-3ghf-949q.