CVE-2026-104970 Race condition in plane
Concurrent unauthenticated requests can race to create multiple instance admin accounts, granting attackers unrestricted administrative access to the Plane instance.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104970?
CVE-2026-104970 is a high-severity vulnerability in makeplane plane, published on 5 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Plane is an open-source project management tool. From 0.13 until 1.4.0, InstanceAdminSignUpEndpoint in apps/api/plane/license/api/views/admin.py:89-117, 173-229 uses InstanceAdmin.objects.first() for the first-admin check and performs account creation without an atomic transaction, row lock, uniqueness guard, or advisory lock. Two concurrent unauthenticated requests with different email addresses can both observe that no instance administrator exists, create separate User and InstanceAdmin rows, and receive sessions with instance-admin authority. This allows an attacker to share unrestricted instance administration with the legitimate operator. This issue is fixed in 1.4.0.
Weakness: CWE-362
Which versions are affected by CVE-2026-104970?
How do I fix CVE-2026-104970?
No fix has been published for CVE-2026-104970 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-104970 being exploited?
There is no known exploitation of CVE-2026-104970 in the wild and no public exploit code.
Sources
Also known as GHSA-p548-28jp-wr4p.