What is CVE-2026-9816?

CVE-2026-9816 is a high-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 8.3/10. Published 2026-08-17.

How severe is CVE-2026-9816?

High severity. CVSS v3 base score is 8.3 out of 10.

Auth bypass in Mattermost

CVE-2026-9816

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fail to validate BoardMember.Scheme* fields server-side on insert and archive-import paths which allows a board editor or non-guest team member to grant board admin to arbitrary users via POST /api/v2/boards/{boardID}/members and POST /api/v2/teams/{teamID}/archive/import.. Mattermost Advisory ID: MMSA-2026-00685

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H.

Affected products

Mattermost — versions 11.7.0, 10.11.0, 11.8.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

responsibledisclosure@mattermost.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-9816?: CVE-2026-9816 is a high-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 8.3/10. Published 2026-08-17.
How severe is CVE-2026-9816?: High severity. CVSS v3 base score is 8.3 out of 10.