CVE-2026-86174 Plane through 1.4.2 Arbitrary Comment Write via Public Deploy Board
Authenticated attackers can post comments to arbitrary issues across workspaces by bypassing project validation in the public deploy board 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-2026-86174?
CVE-2026-86174 is a medium-severity missing authorization vulnerability in makeplane plane, published on 5 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Plane through 1.4.2 fails to validate that issues belong to the deploy board's project in the public comment endpoint. Authenticated attackers can post comments to arbitrary issues across workspaces by supplying an issue_id parameter to the public deploy-board comment endpoint.
Weakness: CWE-639
Which versions are affected by CVE-2026-86174?
How do I fix CVE-2026-86174?
No fix has been published for CVE-2026-86174 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-2026-86174 being exploited?
There is no known exploitation of CVE-2026-86174 in the wild and no public exploit code.
Sources
Also known as GHSA-jw76-hcp8-48r5.