CVE-2025-3227 - CVE House
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Status published Medium CVE-2025-3227

Unauthorized channel member management through playbook runs

Vulnerability Description

Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to properly enforce channel member management permissions in playbook runs, allowing authenticated users without the 'Manage Channel Members' permission to add or remove users from public and private channels by manipulating playbook run participants when the run is linked to a channel.

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:

  • BhaRat (hackit_bharat)

References

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Affected Vendor

Affected Software

Mattermost
Vulnerable Versions:
10.5.0, 9.11.0, 10.8.0, 10.7.0, 10.6.0, 10.9.0, 10.5.6, 9.11.16, 10.8.1, 10.7.3, 10.6.6

Timeline

Official Publish: June 20th, 2025
Last Modified: June 23rd, 2025
Added to House: July 22nd, 2026

CVSS Vectors

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

Weaknesses (CWE)

CWE-863

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1078 Valid Accounts
Persistence
T1548 Abuse Elevation Control Mechanism
Privilege Escalation
T1021 Remote Services
Lateral Movement
T1098 Account Manipulation
Defense Evasion