What is CVE-2026-31272?

CVE-2026-31272 is a critical-severity vulnerability in Mrcms, classified under Improper Access Control. CVSS score: 9.8/10. Published 2026-04-07.

How severe is CVE-2026-31272?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Mrcms

CVE-2026-31272

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.

EPSS: 0.006 (44.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mrcms — versions 3.1.2
N/a — versions n/a

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

cve@mitre.org (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-31272?: CVE-2026-31272 is a critical-severity vulnerability in Mrcms, classified under Improper Access Control. CVSS score: 9.8/10. Published 2026-04-07.
How severe is CVE-2026-31272?: Critical severity. CVSS v3 base score is 9.8 out of 10.