PT-2025-48275 · Mattermost · Mattermost

Hainguyen0207 · Published 2025-10-28 · Updated 2026-01-06 · CVE-2025-12559

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.5.x through 10.5.12 Mattermost versions 10.11.x through 10.11.4 Mattermost versions 10.12.x through 10.12.1 Mattermost versions 11.0.x through 11.0.2

Description The software does not properly restrict access to team email addresses. Specifically, it fails to ensure that team email addresses are only visible to Team Admins. Any authenticated user can view these email addresses by sending a GET request to the /api/v4/channels/{channel id}/common teams API endpoint. The channel id variable is used in the request.

Recommendations Update Mattermost to a version later than 10.5.12. Update Mattermost to a version later than 10.11.4. Update Mattermost to a version later than 10.12.1. Update Mattermost to a version later than 11.0.2.

Fix

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

BDU:2025-15239

CVE-2025-12559

GHSA-4G87-9X45-CX2H

GO-2025-4169

SUSE-SU-2026:0037-1

Affected Products

Mattermost

References · 92

• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/GO-2025-4169 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-12559 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0037-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-15239 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-12559 · Security Note
• https://github.com/mattermost/mattermost/commit/9f54e5cdc3aef412945ff0e6a58338f7b549bdda · Note
• https://github.com/mattermost/mattermost/commit/649aee8fa9184ca59bd66022a33b8f8918e413aa · Note
• https://github.com/mattermost/mattermost/pull/34110 · Note
• https://github.com/mattermost/mattermost/commit/5d8719042c1807da59ac8a821624eb01152d8495 · Note
• https://github.com/mattermost/mattermost/commit/abbf01b9db45d1850eaf3701ea8362b910193ffd · Note
• https://github.com/mattermost/mattermost/commit/7ccb62db7958abd6a4b21a06c5a4f5367a8f8b1f · Note
• https://suse.com/security/cve/CVE-2025-68941 · Note
• https://suse.com/security/cve/CVE-2025-67508 · Note
• https://suse.com/security/cve/CVE-2025-10543 · Note