Mattermost <=10.8.0 Improper Channel Membership Validation via Run Metadata API
CVE-2025-47871 Published on June 30, 2025
Mattermost Playbooks exposes private channel metadata to unauthorized users via run metadata API
Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to properly validate channel membership when retrieving playbook run metadata, allowing authenticated users who are playbook members but not channel members to access sensitive information about linked private channels including channel name, display name, and participant count through the run metadata API endpoint.
Vulnerability Analysis
CVE-2025-47871 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2025-47871 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2025-47871
stack.watch emails you whenever new vulnerabilities are published in Mattermost Server or MatterMost. Just hit a watch button to start following.
Affected Versions
Mattermost:- Version 10.5.0, <= 10.5.5 is affected.
- Version 9.11.0, <= 9.11.15 is affected.
- Version 10.8.0 is affected.
- Version 10.7.0, <= 10.7.2 is affected.
- Version 10.6.0, <= 10.6.5 is affected.
- Version 10.9.0 is unaffected.
- Version 10.5.6 is unaffected.
- Version 9.11.16 is unaffected.
- Version 10.8.1 is unaffected.
- Version 10.7.3 is unaffected.
- Version 10.6.6 is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.