What is CVE-2026-93846?

CVE-2026-93846 is a low-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 3.8/10. Published 2026-10-26.

How severe is CVE-2026-93846?

Low severity. CVSS v3 base score is 3.8 out of 10.

Auth bypass in Mattermost

CVE-2026-93846

Mattermost versions 11.7.x <= 11.7.10 fail to restrict which built-in roles can be assigned to a team member via the API, which allows a team admin to grant a team member permissions beyond those permitted by the configured permission scheme via the {{update-team-member-roles}} REST API.. Mattermost Advisory ID: MMSA-2026-00734

Vulnerability class: Broken Access Control

Published 2026-10-26 · last modified 2026-10-26.

CVSS v3 metric

CVSS v3 base score 3.8 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Mattermost

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

mattermost.com/security-updates (vendor-advisory)

Frequently asked questions

What is CVE-2026-93846?: CVE-2026-93846 is a low-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 3.8/10. Published 2026-10-26.
How severe is CVE-2026-93846?: Low severity. CVSS v3 base score is 3.8 out of 10.