CVE-2026-104969 Plane: Cross-Tenant Cycle Issue Hijack via IDOR
An authenticated user can hijack cycles by adding or removing issues from other workspaces due to missing ownership validation.
- 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-2026-104969?
CVE-2026-104969 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 cycle-issues endpoint accepts issue UUIDs in the request body without validating that they belong to the caller's workspace. An authenticated user can add issues from any workspace to a cycle they control. If a victim issue is already assigned to a cycle, the operation removes it from the victim's cycle, causing a destructive cross-tenant write. This issue is fixed in 1.4.0.
Weakness: CWE-639
Which versions are affected by CVE-2026-104969?
How do I fix CVE-2026-104969?
No fix has been published for CVE-2026-104969 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-2026-104969 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104969 exists.
Sources
Also known as GHSA-22g9-9xfv-q3fr.