CVE-2025-4128

Mattermost Guest User Information Disclosure Vulnerability

Published Jun 11, 2025 CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
Description
Mattermost versions 10.5.x <= 10.5.4, 9.11.x <= 9.11.13 fail to properly restrict API access to team information, allowing guest users to bypass permissions and view information about public teams they are not members of via a direct API call to /api/v4/teams/{team_id}.

Remediation

Vendor Solution

Update Mattermost to versions 10.8.0, 10.5.5, 9.11.14 or higher.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-18094 Mattermost allows guest users to view information about public teams they are not members of
Github GHSA Github GHSA GHSA-jwhw-xf5v-qgxc Mattermost allows guest users to view information about public teams they are not members of
References
History
Type Values Removed Values Added
Metrics epss

{'score': 0.00024}

epss

{'score': 0.00028}

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Vendors & Products Mattermost
Mattermost mattermost Server
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Mattermost versions 10.5.x <= 10.5.4, 9.11.x <= 9.11.13 fail to properly restrict API access to team information, allowing guest users to bypass permissions and view information about public teams they are not members of via a direct API call to /api/v4/teams/{team_id}.
Title Mattermost Guest User Information Disclosure Vulnerability
Weaknesses CWE-863
References
Metrics cvssV3_1

{'score': 3.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Jun 11, 2025, 1:12 PM
Reserved
Apr 30, 2025, 7:45 AM
Status
Analyzed
Published
Jun 11, 2025, 11:15 AM
Modified
Jun 17, 2026, 9:32 AM