What is CVE-2025-10545?

CVE-2025-10545 is a low-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 3.1/10. Published 2025-10-16.

How severe is CVE-2025-10545?

Low severity. CVSS v3 base score is 3.1 out of 10.

Auth bypass in Mattermost

CVE-2025-10545

Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the `/api/v4/channels/{ch…

Vulnerability class: Broken Access Control

EPSS: 0.003 (22.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

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

Affected products

Mattermost — versions 10.5.0, 10.11.0, 10.12.0
Mattermost Mattermost_server

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

responsibledisclosure@mattermost.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-10545?: CVE-2025-10545 is a low-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 3.1/10. Published 2025-10-16.
How severe is CVE-2025-10545?: Low severity. CVSS v3 base score is 3.1 out of 10.