MongoDB X509 Role Bypass via PROXY v2 on Unix Socket
CVE-2026-13067 Published on July 22, 2026
tlsCATrusts Role Restriction Not Enforced via PROXY Protocol v2 on Unix Domain Socket
When PROXY protocol v2 is used on the Unix domain socket path, roles derived from X.509 client certificates may not be validated against the configured tlsCATrusts allow-list. This can result in unintended role assignments following MONGODB-X509 authentication. Affected scenarios require local access to the proxy Unix domain socket and a valid X.509 certificate issued by a trusted certificate authority.
Vulnerability Analysis
CVE-2026-13067 can be exploited with local system 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 and 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-2026-13067 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-13067
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Affected Versions
MongoDB Server:- Version 8.0 and below 8.0.28 is affected.
- Version 8.3.0 and below 8.3.7 is affected.
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.