CVE-2025-12559 Details
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
A vulnerability exists in Mattermost versions 11.0.x through 11.0.2, 10.12.x through 10.12.1, 10.11.x through 10.11.4, and 10.5.x through 10.5.12. These versions fail to properly restrict visibility of team email addresses, allowing any authenticated user to access this information through the 'GET /api/v4/channels/{channel_id}/common_teams' endpoint.
Users can upgrade to Mattermost versions 11.2.0, 11.1.0, or 10.12.2 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Nov 28, 2025References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://mattermost.com/security-updates | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-200 | Exposure of Sensitive Information to an Unauthorized Actor | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| mattermost mattermost server | >= 10.5.0, < 10.5.13 >= 10.11.0, < 10.11.5 >= 10.12.0, < 10.12.2 >= 11.0.0, < 11.0.3 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Dec 3, 2025 | Initial Analysis | [email protected] |
| Nov 27, 2025 | New CVE Received | [email protected] |