Mattermost <=10.4.2: Channel Conversion Privilege Escalation
CVE-2025-27933 Published on March 21, 2025
Unauthorized Private-to-Public Channel Conversion
Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to fail to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public
Vulnerability Analysis
CVE-2025-27933 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 and 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-2025-27933 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2025-27933
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Affected Versions
Mattermost:- Version 10.4.0, <= 10.4.2 is affected.
- Version 10.3.0, <= 10.3.3 is affected.
- Version 9.11.0, <= 9.11.8 is affected.
- Version 10.5.0 is unaffected.
- Version 10.4.3 is unaffected.
- Version 10.3.4 is unaffected.
- Version 9.11.9 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.