CVE-2025-12559
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-27

Last updated on: 2025-12-03

Assigner: Mattermost, Inc.

Description
Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to sanitize team email addresses to be visible only to Team Admins, which allows any authenticated user to view team email addresses via the GET /api/v4/channels/{channel_id}/common_teams endpoint
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Meta Information
Published
2025-11-27
Last Modified
2025-12-03
Generated
2026-06-16
AI Q&A
2025-11-27
EPSS Evaluated
2026-06-15
NVD
CVE-2025-12559
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
mattermost mattermost_server From 10.5.0 (inc) to 10.5.13 (exc)
mattermost mattermost_server From 10.11.0 (inc) to 10.11.5 (exc)
mattermost mattermost_server From 10.12.0 (inc) to 10.12.2 (exc)
mattermost mattermost_server From 11.0.0 (inc) to 11.0.3 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
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Executive Summary

This vulnerability exists in certain versions of Mattermost where team email addresses are not properly restricted and sanitized. As a result, any authenticated user can access and view team email addresses through the GET /api/v4/channels/{channel_id}/common_teams endpoint, even though these email addresses should only be visible to Team Admins.

Impact Analysis

The vulnerability can lead to unauthorized disclosure of team email addresses to any authenticated user. This could increase the risk of phishing attacks, spam, or other social engineering attacks targeting team members, potentially compromising organizational security and privacy.

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