CVE-2025-12559

Description

Mattermost fails to sanitize team email addresses in github.com/mattermost/mattermost-server. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/mattermost/mattermost-server from v10.5.0 before v10.5.13, from v10.11.0 before v10.11.5, from v10.12.0 before v10.12.2, from v11.0.0 before v11.0.3.

How to fix CVE-2025-12559

To remediate CVE-2025-12559, upgrade the affected package to a fixed version below.

• —upgrade to 11.0.3 or later
• —no fix listed
• —no fix listed
• —no fix listed
• —upgrade to 8.0.0-20251015091448-abbf01b9db45 or later
• —upgrade to 8.0.0-20251015091448-abbf01b9db45 or later

Is CVE-2025-12559 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (6)

• >= 11.0.0, < 11.0.3
• from 0
• from 0
• from 0
• from 0, < 8.0.0-20251015091448-abbf01b9db45
• from 0, < 8.0.0-20251015091448-abbf01b9db45

CVSS scores

References (10)

• ADVISORYgithub.com/advisories/GHSA-4g87-9x45-cx2h
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2025-12559
• PATCHgithub.com/mattermost/mattermost
• WEBgithub.com/mattermost/mattermost/commit/5d8719042c1807da59ac8a821624eb01152d8495