CVE-2026-104965 Plane: Cross-Tenant Issue Relation Creation via IDOR
Authenticated users can link their issues to other workspaces via IDOR, leaking metadata and modifying relations in Plane project management.
- 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-2026-104965?
CVE-2026-104965 is a medium-severity missing authorization 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, the issue-relation endpoint accepts issue UUIDs in the request body without validating that they belong to the caller's workspace. An authenticated user can create relations linking their own issues to issues in any other workspace on the instance, leaking issue metadata through activity events. This issue is fixed in 1.4.0.
Weakness: CWE-639
Which versions are affected by CVE-2026-104965?
How do I fix CVE-2026-104965?
No fix has been published for CVE-2026-104965 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-2026-104965 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104965 exists.
Sources
Also known as GHSA-8cvv-8jh5-g6mj.