CVE-2026-31272 Missing authorization in n/a

Critical 9.8 Published 7 Apr 2026 Updated 9 Apr 2026

Unauthenticated attackers can create super administrator accounts due to missing authorization checks in the user controller.

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-2026-31272?

CVE-2026-31272 is a critical missing authorization vulnerability in n/a, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

MRCMS 3.1.2 contains an access control vulnerability. The save() method in src/main/java/org/marker/mushroom/controller/UserController.java lacks proper authorization validation, enabling direct addition of super administrator accounts without authentication.

Weakness: CWE-284

Which versions are affected by CVE-2026-31272?

It affects 1 product.

Products include Mrcms Mrcms.

How do I fix CVE-2026-31272?

No fix has been published for CVE-2026-31272 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-2026-31272 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-31272 exists.

Sources

Also known as GHSA-84xj-452r-299m.