Email Address Exposure in Mattermost by Mattermost Inc.
CVE-2025-12559

4.3MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
27 November 2025

What is CVE-2025-12559?

Mattermost versions prior to specific updates contain a vulnerability that fails to properly restrict visibility of team email addresses. Authenticated users can exploit this flaw through the API endpoint, gaining unauthorized access to sensitive team information that should only be available to Team Admins. This exposure poses privacy risks and highlights the importance of robust access controls in software applications.

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Affected Version(s)

Mattermost 11.0.0 <= 11.0.2

Mattermost 10.12.0 <= 10.12.1

Mattermost 10.11.0 <= 10.11.4

References

https://mattermost.com/security-updates

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

hainguyen0207
JSON
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