CVE-2026-33216

Medium

Elevated severity or exploit probability.

CVSS base

8.6 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS — probability of exploitation (30 days)

0.4%

30.4th percentile

CISA KEV

Not listed

Weakness / dates

CWE-213

Published 2026-03-25 · modified 2026-09-09

CVSS breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Attack Vector	N	Network
Attack Complexity	L	Low
Privileges Required	N	None
User Interaction	N	None
Scope	C	Changed
Confidentiality	H	High
Integrity	N	None
Availability	N	None

Timeline

2026-03-25 — Published (NVD)
2026-09-09 — Last modified (NVD)

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.

Affected

linuxfoundation

References

Official: NVD · CVE.org