Auth bypass in Mattermost

CVE-2025-49810

Mattermost versions 10.5.x <= 10.5.8 fail to validate access controls at time of access which allows user to read a thread via AI posts

Vulnerability class: Broken Access Control

EPSS: 0.002 (10.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N.

Affected products

Mattermost — versions 10.5.0, 10.10.0, 10.5.9
Mattermost Mattermost_server

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

responsibledisclosure@mattermost.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-49810?: CVE-2025-49810 is a low-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 3.5/10. Published 2025-08-21.
How severe is CVE-2025-49810?: Low severity. CVSS v3 base score is 3.5 out of 10.