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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Fixes

Solution

Update Mattermost to versions 11.3.0, 11.1.3, 10.11.10, 11.2.2 or higher.


Workaround

No workaround given by the vendor.

References
History

Tue, 17 Feb 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 17 Feb 2026 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost

Mon, 16 Feb 2026 12:30:00 +0000

Type Values Removed Values Added
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
Title Information disclosure via channel mentions in posts
Weaknesses CWE-862
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2026-02-17T17:06:07.112Z

Reserved: 2025-12-09T15:43:31.735Z

Link: CVE-2025-14350

cve-icon Vulnrichment

Updated: 2026-02-17T16:42:14.334Z

cve-icon NVD

Status : Received

Published: 2026-02-16T13:15:59.953

Modified: 2026-02-16T13:15:59.953

Link: CVE-2025-14350

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-17T08:49:46Z

Weaknesses