What is CVE-2026-75025?

CVE-2026-75025 is a medium-severity vulnerability in Mattermost, classified under Origin Validation Error. CVSS score: 4.7/10. Published 2026-09-16.

How severe is CVE-2026-75025?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Mattermost

CVE-2026-75025

Mattermost Desktop App versions <=6.2 6.2.2.0 Fixed an issue where Mattermost Desktop did not sufficiently restrict server-rendered content from accessing local or private network resources. Thanks to game0v3r for contributing to this improvement under the Mattermost responsible disclosure policy. Mattermost Advisory ID: MMSA-2026-00698

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N.

Affected products

Mattermost

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

responsibledisclosure@mattermost.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-75025?: CVE-2026-75025 is a medium-severity vulnerability in Mattermost, classified under Origin Validation Error. CVSS score: 4.7/10. Published 2026-09-16.
How severe is CVE-2026-75025?: Medium severity. CVSS v3 base score is 4.7 out of 10.