CVE-2025-6226

IDOR in CreatePost API allows for timeboxed message disclosure

Description

Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.

Remediation

Solution:

  • Update Mattermost to versions 10.9.0, 10.5.7, 10.8.2, 10.7.4, 9.11.17 or higher.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.03%
Affected: Mattermost Mattermost
Published at:
Updated at:

References

Link Tags
https://mattermost.com/security-updates

Frequently Asked Questions

What is the severity of CVE-2025-6226?
CVE-2025-6226 has been scored as a medium severity vulnerability.
How to fix CVE-2025-6226?
To fix CVE-2025-6226: Update Mattermost to versions 10.9.0, 10.5.7, 10.8.2, 10.7.4, 9.11.17 or higher.
Is CVE-2025-6226 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-6226 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-6226?
CVE-2025-6226 affects Mattermost Mattermost.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.