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.

Published: Aug 21, 2025
Updated: Aug 23, 2025
CVE: CVE-2025-6465
GHSA: GHSA-pj6f-rc94-gw53
Severity: Medium
Exploit:

CVSS v3:

Severity: Unknown
Score:
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CWEs:

CWE-22

OWASP TOP 10:

A5 - Broken Access Control

Affected Software
References

Software	From	Fixed in
github.com/mattermost/mattermost-server	10.8.0	10.8.4
github.com/mattermost/mattermost-server	10.5.0	10.5.9
github.com/mattermost/mattermost-server	10.9.0	10.9.4
github.com/mattermost/mattermost-server	10.10.0	10.10.0.x
github.com/mattermost/mattermost-server	10.10.0	10.10.1
github.com/mattermost/mattermost/server/v8	-	8.0.0-20250708173752-d6b35c41f0ae5

https://mattermost.com/security-updates
https://pkg.go.dev/vuln/GO-2025-3906

Vulnerability Database

CVE-2025-6465