CVE-2025-12559 MEDIUM

CVE-2025-12559: Information Disclosure in Common Teams API

Vendor Mattermost
Product Mattermost
Weakness CWE-200 · Info exposure
Published November 27, 2025
Last update November 28, 2025
View on NVD All CVEs

CVSS base score

4.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality Low
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

November 27, 2025 CVE published
November 28, 2025 Record updated