CVE-2025-9076
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-15

Last updated on: 2025-09-20

Assigner: Mattermost, Inc.

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.
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Meta Information
Published
2025-09-15
Last Modified
2025-09-20
Generated
2026-06-16
AI Q&A
2025-09-15
EPSS Evaluated
2026-06-14
NVD
CVE-2025-9076
EUVD
EUVD-2025-29165
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
mattermost mattermost_server From 10.10.0 (inc) to 10.10.2 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
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Executive Summary

This vulnerability occurs in Mattermost versions 10.10.x up to 10.10.1, where the software fails to properly sanitize user data during the synchronization of shared channel memberships. As a result, malicious or compromised remote clusters can access sensitive user information through unsanitized user objects. This issue affects Mattermost Server instances that have shared channels enabled.

Impact Analysis

The vulnerability can lead to unauthorized access to sensitive user information by malicious or compromised remote clusters. This can result in exposure of confidential data, potentially leading to privacy breaches and increased risk of further attacks or misuse of user information.

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