MongoDB Server Auth Bypass via Cert Despite Disabled Method
CVE-2026-18703 Published on August 11, 2026
Improper Enforcement of Authentication Mechanism Restrictions in MongoDB Server Allows Use of Disabled Authentication Method
An issue in MongoDB Server could allow a party with a valid client certificate and a corresponding user account to authenticate using a certificate-based authentication method, even when an administrator has configured the server to restrict authentication to other mechanisms. This could allow authentication through a method the administrator intended to disable.
Vulnerability Analysis
CVE-2026-18703 can be exploited with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of 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-2026-18703 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-18703
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Affected Versions
MongoDB Server:- Version 8.3.0 and below 8.3.8 is affected.