Improper Authentication in nats-server - CVE-2026-33215
Published: April 23, 2026
Vulnerability identifier: #VU126874
CSH Severity: High
CVSS v4: 8.3 [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]
CVE-ID: CVE-2026-33215
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
nats-server
How to mitigate CVE-2026-33215
Install updates from vendor's website.
nats-server - addressed in versions 2.11.15, 2.12.6