Mattermost <=11.1 Vulnerable Jira Plugin Allows Unauthorized Channel Read
CVE-2025-13767 Published on December 24, 2025
Unauthorized Read Access to Private Channel Posts via Mattermost Jira Plugin
Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to.
Vulnerability Analysis
CVE-2025-13767 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 a small impact on confidentiality, a small impact on integrity and 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-2025-13767 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2025-13767
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Affected Versions
Mattermost:- Version 11.1.0, <= 11.1.0 is affected.
- Version 11.0.0, <= 11.0.5 is affected.
- Version 10.12.0, <= 10.12.3 is affected.
- Version 10.11.0, <= 10.11.7 is affected.
- Version 11.2.0 is unaffected.
- Version 11.1.1 is unaffected.
- Version 11.0.6 is unaffected.
- Version 10.12.4 is unaffected.
- Version 10.11.8 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.