CVE-2023-6547

Playbooks access/modification by removed team member

Published Dec 12, 2023 CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Description
Mattermost fails to validate team membership when a user attempts to access a playbook, allowing a user with permissions to a playbook but no permissions to the team the playbook is on to access and modify the playbook. This can happen if the user was once a member of the team, got permissions to the playbook and was then removed from the team. 

Remediation

Vendor Solution

Update Mattermost Server to versions 8.1.6, 9.2.2 or higher.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2023-58777 Mattermost fails to validate team membership when a user attempts to access a playbook, allowing a user with permissions to a playbook but no permissions to the team the playbook is on to access and modify the playbook. This can happen if the user was once a member of the team, got permissions to the playbook and was then removed from the team. 
References
History
Type Values Removed Values Added
Metrics ssvc

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
May 12, 2025, 7:28 PM
Reserved
Dec 6, 2023, 8:47 AM
Status
Modified
Published
Dec 12, 2023, 9:15 AM
Modified
Jun 17, 2026, 6:50 AM