CVE-2026-18712: MongoDB

High severity, CVSS 8.1. EPSS: 0.2% chance of exploitation in the next 30 days.

An issue in MongoDB Server's Queryable Encryption maintenance operations could allow an authenticated user with privileges on one encrypted collection to cause unauthorized modification or destruction of data belonging to a different collection. This is due to insufficient validation of certain internal metadata references before they are used to perform operations on other namespaces.

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 2026-09-25.