CVE-2026-81518: MongoDB BI Connector

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

When mongosqld is configured with a client certificate authority file, the listener requests a client certificate during the TLS handshake but does not require one, so a client that presents no certificate is still accepted. In deployments that rely on client certificates as the sole means of identifying users, a remote party with network access to the listener can therefore establish a session and read the MongoDB data exposed through the connector.

Affected products

• MongoDB BI Connector: before 2.14.31 (fixed in 2.14.31)

Published 2026-08-28. Last modified 2026-09-29.