CVE-2025-6227

Name: CVE-2025-6227
Creator: NVD / NIST
Published: 2025-07-18T12:15:23.843+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.1/10EPSS 0.18%

Last modified Jun 17, 2026

CVE-2025-6227 is a low-severity vulnerability rated 3.1/10 on the CVSS scale. Mattermost versions 10.5.x <= 10.5.7, 9.11.x <= 9.11.16 fail to negotiate a new token when accepting the invite which allows a user that intercepts both invite and password to send synchronization payloads to the server that originally created the invite via the REST API.. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

Description

Mattermost versions 10.5.x <= 10.5.7, 9.11.x <= 9.11.16 fail to negotiate a new token when accepting the invite which allows a user that intercepts both invite and password to send synchronization payloads to the server that originally created the invite via the REST API.

Metrics

CVSS 3.1

3.1/10

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

EPSS Probability

0.18%

7.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-522

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Server	>= 9.11.0, < 9.11.17
Mattermost	Mattermost Server	>= 10.5.0, < 10.5.8

References

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

Timeline

Published: Jul 18, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-6227?

How severe is CVE-2025-6227?

CVE-2025-6227 has a CVSS score of 3.1/10 (LOW severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.

How do I fix CVE-2025-6227?

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-2025-6227?

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

Scan your code now

Source: NVD / NIST