CVE-2026-18690: MongoDB

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

An issue in MongoDB Server could allow an authenticated user with a limited database-scoped role to perform an action against protected system collections that their assigned privileges should not permit. This could result in critical system collections being dropped and recreated without proper authorization.

Affected products

• MongoDB MongoDB: from 7.0.0, before 7.0.40 (fixed in 7.0.40); from 8.0.0, before 8.0.29 (fixed in 8.0.29); from 8.2.0, up to and including 8.2.12; from 8.3.0, before 8.3.8 (fixed in 8.3.8); version 9.0.0 only; version 9.1.0 only

Published 2026-08-11. Last modified 2026-09-16.