Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2025-9076
CVE-2025-9076:
vulnerability analysis and mitigation
Overview
Mattermost versions 10.10.x <= 10.10.1 contain a security vulnerability related to improper user data sanitization during shared channel membership synchronization. The vulnerability was disclosed on September 15, 2025, and affects Mattermost Server instances that have shared channels enabled (NVD, AttackerKB).
Technical details
The vulnerability is tracked as CVE-2025-9076 and has been assigned a CVSS v3.1 base score of 6.5 (Medium). The attack vector is network-based, with low attack complexity and requiring low privileges. No user interaction is needed for exploitation. The vulnerability stems from insufficient sanitization of user objects during the synchronization process of shared channel memberships (NVD).
Impact
When exploited, this vulnerability allows malicious or compromised remote clusters to access sensitive user information through unsanitized user objects. The CVSS metrics indicate high impact on confidentiality while integrity and availability remain unaffected (NVD).
Mitigation and workarounds
Users should upgrade their Mattermost Server installations to versions newer than 10.10.1. The vulnerability specifically affects versions 10.10.x <= 10.10.1, and upgrading to a patched version is the recommended mitigation strategy (NVD).
Additional resources
Source: This report was generated using AI
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