Team Membership Vulnerability in Mattermost by Mattermost
CVE-2025-14350

4.3MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
16 February 2026

What is CVE-2025-14350?

Certain versions of Mattermost exhibit a vulnerability where authenticated users can improperly validate team membership. By posting channel shortlinks and analyzing the response from the API, users can potentially discover team existence and their corresponding URLs. This raises concerns about information disclosure that could be leveraged for further exploitation. It is crucial for Mattermost users to be aware of this issue and consider updating to unaffected versions.

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Affected Version(s)

Mattermost 11.1.0 <= 11.1.2

Mattermost 10.11.0 <= 10.11.9

Mattermost 11.2.0 <= 11.2.1

References

https://mattermost.com/security-updates
vendor-advisory

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Harrison Healey
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