CVE-2026-104894 Plane: Cross-Tenant Module Issue Linking via IDOR
Authenticated users can link issues from other workspaces to their own modules due to missing ownership validation, allowing cross-tenant data manipulation.
- 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-2026-104894?
CVE-2026-104894 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 modules endpoint accepts issue UUIDs in the URL path without validating that they belong to the caller's workspace. An authenticated user can link issues from any workspace to modules in their own workspace. This issue is fixed in 1.4.0.
Weakness: CWE-639
Which versions are affected by CVE-2026-104894?
How do I fix CVE-2026-104894?
No fix has been published for CVE-2026-104894 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-2026-104894 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104894 exists.
Sources
Also known as GHSA-x5c5-hmvm-94v9.