CVE-2025-6226 - CVE House
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Status published Medium CVE-2025-6226

IDOR in CreatePost API allows for timeboxed message disclosure

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Dawid Kulikowski (daw10)

References

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Affected Vendor

Affected Software

Mattermost
Vulnerable Versions:
10.5.0, 10.8.0, 10.7.0, 9.11.0, 10.9.0, 10.5.8, 10.8.2, 10.7.4, 9.11.17

Timeline

Official Publish: July 18th, 2025
Last Modified: August 7th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Weaknesses (CWE)

CWE-306

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1078 Valid Accounts
Persistence
T1136 Create Account
Persistence
T1098 Account Manipulation
Privilege Escalation
T1021 Remote Services
Lateral Movement