Description
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, for MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints. Versions 2.11.14 and 2.12.6 contain a fix. As a workaround, ensure monitoring end-points are adequately secured. Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.
Problem types
CWE-256: Plaintext Storage of a Password
Product status
>= 2.12.0-RC.1, < 2.12.6
References
github.com/...server/security/advisories/GHSA-v722-jcv5-w7mc
github.com/...ommit/b5b63cfc35a57075e09c1f57503d31721bed8099
advisories.nats.io/CVE/secnote-2026-05.txt