Main Vulnerability Database Vulnerabilities #VU126874

Improper Authentication in nats-server - CVE-2026-33215

Published: April 23, 2026

Vulnerability identifier: #VU126874

CSH Severity: High

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

CVE-ID: CVE-2026-33215

CWE-ID: CWE-287

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 authentication process.

The vulnerability exists due to the MQTT hijacking issue via Client ID. A remote attacker can hijack sessions and messages on the target system.

Install updates from vendor's website.