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.
Scores
CVSS v3
8.6
EPSS
0.0005
EPSS Percentile
14.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-256
Status
published
Products (5)
linuxfoundation/nats-server
< 2.11.15
nats-io/nats-server
0Go
nats-io/nats-server
0 - 2.11.15Go
nats-io/nats-server
< 2.11.15
nats-io/nats-server
>= 2.12.0-RC.1, < 2.12.6
Published
Mar 25, 2026
Tracked Since
Mar 26, 2026