What is CVE-2026-2462?

CVE-2026-2462 is a medium-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 6.6/10. Published 2026-03-16.

How severe is CVE-2026-2462?

Medium severity. CVSS v3 base score is 6.6 out of 10.

Auth bypass in Mattermost

CVE-2026-2462

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to restrict plugin installation on CI test instances with default admin credentials which allows an unauthenticated attacker to achieve remote code execution…

Vulnerability class: Broken Access Control

EPSS: 0.002 (42.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L.

Affected products

Mattermost — versions 11.3.0, 11.2.0, 10.11.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

MMSA-2025-00528 (vendor-advisory)

Frequently asked questions

What is CVE-2026-2462?: CVE-2026-2462 is a medium-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 6.6/10. Published 2026-03-16.
How severe is CVE-2026-2462?: Medium severity. CVSS v3 base score is 6.6 out of 10.