CVE-2025-6465

Name: CVE-2025-6465
Creator: NVD / NIST
Published: 2025-08-21T17:15:32.707+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.70%

Last modified Jun 17, 2026

CVE-2025-6465 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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.. EPSS estimates a 0.70% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

0.70%

48.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Server	>= 10.5.0, < 10.5.9
Mattermost	Mattermost Server	>= 10.8.0, < 10.8.4
Mattermost	Mattermost Server	>= 10.9.0, < 10.9.4
Mattermost	Mattermost Server	10.10.0

References

https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: Aug 21, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-6465?

How severe is CVE-2025-6465?

CVE-2025-6465 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.

How do I fix CVE-2025-6465?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-6465?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST