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CVE-2025-9076

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Date: September 15, 2025

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.

Severity Score

Related Resources (5)

https://nvd.nist.gov/vuln/detail/CVE-2025-9076
https://github.com/advisories/GHSA-3vcm-c42p-3hhf
https://github.com/mattermost/mattermost
https://mattermost.com/security-updates
https://www.mend.io/vulnerability-database/CVE-2025-9076

Severity Score

Weakness Type (CWE)

Missing Authorization

CWE-862

Top Fix

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Upgrade Version

Upgrade to version github.com/mattermost/mattermost - v10.10.2;github.com/mattermost/mattermost/server/v8 - v8.0.0-20250729073403-517ae758cd02;github.com/mattermost/mattermost-server - v10.10.2

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): NONE

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