CVE-2025-14350
Received Received - Intake

Information Disclosure via Improper Team Validation in Mattermost

Publication date: 2026-02-16

Last updated on: 2026-02-18

Assigner: Mattermost, Inc.

Description
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the channel_mentions property in the API response. Mattermost Advisory ID: MMSA-2025-00563

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Meta Information

Published
2026-02-16
Last Modified
2026-02-18
Generated
2026-07-06
AI Q&A
2026-02-16
EPSS Evaluated
2026-07-05
NVD
CVE-2025-14350
EUVD
EUVD-2025-206980

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
mattermost mattermost_server From 10.11.0 (inc) to 10.11.10 (exc)
mattermost mattermost_server From 11.2.0 (inc) to 11.2.2 (exc)
mattermost mattermost_server From 11.1.0 (inc) to 11.1.3 (exc)

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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 affects certain versions of Mattermost (11.1.x up to 11.1.2, 10.11.x up to 10.11.9, and 11.2.x up to 11.2.1) where the software fails to properly validate team membership when processing channel mentions.

Because of this improper validation, authenticated users can determine whether specific teams exist and discover their URL names by posting channel shortlinks and observing the channel_mentions property in the API response.

Impact Analysis

The impact of this vulnerability is that authenticated users can gain information about the existence of teams and their URL names that they might not otherwise have access to.

This could potentially lead to information disclosure, allowing users to map out team structures or URLs, which might be used in further targeted attacks or reconnaissance.

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