CVE-2025-14350

Information disclosure via channel mentions in posts

Published: Feb 16, 2026Updated: Feb 18, 2026 Sources: CVE List NVD GHSACWE-862

4.3MEDIUM

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

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:LConfidentiality

Low

I:NIntegrity

None

A:NAvailability

None

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Weaknesses

CWE-862

Affected Products

Mattermost

commercial·US

MattermostOn-premWeb App

Communications / messaging-chat

mattermost serverOn-premWeb App

Communications / messaging-chat

package-ecosystem

github.com/mattermost/mattermost/server/v8

OSS Libraries

github.com/mattermost/mattermost-server

OSS Libraries

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Initial Access

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References

https://mattermost.com/security-updates

mattermost.com

https://nvd.nist.gov/vuln/detail/CVE-2025-14350

nvd.nist.gov

https://github.com/mattermost/mattermost/commit/761e56bb11ccb751ddbe4bab5898ccc2b384fd82

github.com

and 1 more references View all →

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