GitHub Advisoryadvisory · Go

GHSA-4g87-9x45-cx2h Mattermost fails to sanitize team email addresses

MEDIUM Published 2025-11-27 Modified 2025-12-01 Official page ↗
Aliases
CVE-2025-12559
Ecosystem
Go
Packages
github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weaknesses
CWE-200
Reviewed
2025-12-01

Affected packages

• Go github.com/mattermost/mattermost/server/v8: < 8.0.0-20251015091448-abbf01b9db45 → fixed in 8.0.0-20251015091448-abbf01b9db45 • Go github.com/mattermost/mattermost-server: >= 11.0.0, < 11.0.3 → fixed in 11.0.3 • Go github.com/mattermost/mattermost-server: >= 10.12.0, < 10.12.2 → fixed in 10.12.2 • Go github.com/mattermost/mattermost-server: >= 10.11.0, < 10.11.5 → fixed in 10.11.5 • Go github.com/mattermost/mattermost-server: >= 10.5.0, < 10.5.13 → fixed in 10.5.13

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

Related

Alias · CVE (1)

  • CVE-2025-12559 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… vulnerability

Weakness · CWE (1)

  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor weakness

References