What is CVE-2026-10106?

CVE-2026-10106 is a medium-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2026-07-13.

How severe is CVE-2026-10106?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Mattermost

CVE-2026-10106

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify that the channel referenced in an action cookie matches the channel of the target post, which allows an authenticated user without access to a priva…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Mattermost — versions 11.7.0, 11.6.0, 10.11.0
Mattermost Mattermost_server

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

responsibledisclosure@mattermost.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-10106?: CVE-2026-10106 is a medium-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2026-07-13.
How severe is CVE-2026-10106?: Medium severity. CVSS v3 base score is 6.5 out of 10.