Mattermost versions 10.10.x <= 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects Mattermost Server instances with shared channels enabled.
References
History

Wed, 17 Sep 2025 11:00:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost

Mon, 15 Sep 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 15 Sep 2025 10:15:00 +0000

Type Values Removed Values Added
Description Mattermost versions 10.10.x <= 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects Mattermost Server instances with shared channels enabled.
Title Mattermost Server exposes sensitive user credentials during shared channel membership synchronization
Weaknesses CWE-862
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published: 2025-09-15T10:06:15.094Z

Updated: 2025-09-15T14:05:16.235Z

Reserved: 2025-08-15T15:26:17.148Z

Link: CVE-2025-9076

cve-icon Vulnrichment

Updated: 2025-09-15T14:05:11.941Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-09-15T10:15:32.450

Modified: 2025-09-15T15:21:42.937

Link: CVE-2025-9076

cve-icon Redhat

No data.