What’s Vulnerable › Vulnerabilities
CVE-2026-81518: BI Connector Optional Client Certificate Verification Allows Unauthenticated Connections
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-28 · updated 2026-09-29
- Weakness: CWE-295
Description
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
How to fix
Upgrade to a fixed version: MongoDB BI Connector 2.14.31. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-81518 or the next vulnerability affects your stack