Is CVE-2026-18703 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-18703?

CVE-2026-18703 has a CVSS v3 severity of MEDIUM (4.2).

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CVE-2026-18703

Description

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.