CVE-2026-39374 Plane IDOR: Cross-Project Issue Date Modification via Bulk Update Endpoint

Medium 6.5 Published 7 Apr 2026 Updated 8 Apr 2026

A project member can modify issue dates across any workspace or project due to missing authorization checks in the bulk update endpoint.

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-2026-39374?

CVE-2026-39374 is a medium-severity missing authorization vulnerability in makeplane plane, published on 7 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Plane is an an open-source project management tool. Prior to 1.3.0, the IssueBulkUpdateDateEndpoint allows a project member (ADMIN or MEMBER) to modify the start_date and target_date of ANY issue across the entire Plane instance, regardless of workspace or project membership. The endpoint fetches issues by ID without filtering by workspace or project, enabling cross-boundary data modification. This vulnerability is fixed in 1.3.0.

Weakness: CWE-639

Which versions are affected by CVE-2026-39374?

It affects 1 product.

Products include Plane Plane.

How do I fix CVE-2026-39374?

No fix has been published for CVE-2026-39374 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-2026-39374 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39374 exists.

Sources

Also known as GHSA-4q54-h4x9-m329.