CVE-2023-6727

Leak Inaccessible Playbook Information via Channel Action IDOR

Published Dec 12, 2023 CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
Description
Mattermost fails to perform correct authorization checks when creating a playbook action, allowing users without access to the playbook to create playbook actions. If the playbook action created is to post a message in a channel based on specific keywords in a post, some playbook information, like the name, can be leaked. 

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-2023-58941 Mattermost fails to perform correct authorization checks when creating a playbook action, allowing users without access to the playbook to create playbook actions. If the playbook action created is to post a message in a channel based on specific keywords in a post, some playbook information, like the name, can be leaked. 
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 24, 2025, 10:25 AM
Reserved
Dec 12, 2023, 10:48 AM
Status
Modified
Published
Dec 12, 2023, 11:15 AM
Modified
Jun 17, 2026, 6:51 AM