What is CVE-2025-6465?

CVE-2025-6465 is a medium-severity vulnerability in Mattermost, classified under Path Traversal. CVSS score: 4.3/10. Published 2025-08-21.

How severe is CVE-2025-6465?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Path Traversal in Mattermost

CVE-2025-6465

Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 10.10.x <= 10.10.0, 10.9.x <= 10.9.3 fail to sanitize file names which allows users with file upload permission to overwrite file attachment thumbnails via path traversal in file streaming APIs.

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.007 (51.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

Affected products

Mattermost — versions 10.8.0, 10.5.0, 10.10.0
Mattermost Mattermost_server — versions 10.10.0

Weakness classification (CWE)

CWE-22 — Path Traversal

References

responsibledisclosure@mattermost.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-6465?: CVE-2025-6465 is a medium-severity vulnerability in Mattermost, classified under Path Traversal. CVSS score: 4.3/10. Published 2025-08-21.
How severe is CVE-2025-6465?: Medium severity. CVSS v3 base score is 4.3 out of 10.