Main Vulnerability Database Vulnerabilities #VU126864

Incorrect authorization in nats-server - CVE-2026-33217

Published: April 22, 2026

Vulnerability identifier: #VU126864

CSH Severity: Medium

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2026-33217

CWE-ID: CWE-863

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vendor: NATS - The Cloud Native Messaging System

Affected software:
nats-server

Detailed vulnerability description

The vulnerability allows a remote attacker to bypass authorization checks.

The vulnerability exists due to insufficient authorization controls. A remote user can bypass ACL checks for MQTT subjects

Install updates from vendor's website.