CVE-2026-18703 — MEDIUM (4.2)

Q: How severe is CVE-2026-18703?

CVE-2026-18703 has been rated MEDIUM with a CVSS base score of 4.2/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-18703?

Check the references section above for vendor advisories and patch information. Affected products include: Mongodb Mongodb.

Vulnerability 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.

CVSS Score

4.2

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Mongodb	Mongodb	>= 8.2.0, <= 8.2.12

Related Weaknesses (CWE)

CWE-863

References

https://jira.mongodb.org/browse/SERVER-127863Vendor AdvisoryIssue Tracking

FAQ

What is CVE-2026-18703?

CVE-2026-18703 is a vulnerability with a CVSS score of 4.2 (MEDIUM). 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 administra...

How severe is CVE-2026-18703?

CVE-2026-18703 has been rated MEDIUM with a CVSS base score of 4.2/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-18703?

Check the references section above for vendor advisories and patch information. Affected products include: Mongodb Mongodb.