VULNERABILITY INTELLIGENCE

CVE-2025-9076

CVSS score6.5 MEDIUM
EPSS probability0.26%
CISA KEVNot currently listed
Published2025-09-15
Last modified2026-10-19
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

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.

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-862

Primary references