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NATS-Server MQTT ACL Bypass Vulnerability

Vulnerability

A vulnerability exists in NATS-Server versions prior to 2.12.6 and 2.11.15, where Access Control Lists (ACLs) on message subjects were not enforced in the '$MQTT.>' namespace. This oversight allowed MQTT clients to circumvent ACL checks for MQTT-related subjects.

Impact

Exploitation of this vulnerability could lead to unauthorized access or actions on MQTT subjects, bypassing established ACL restrictions.

Added: Mar 25, 2026, 10:27 PM
Updated: Mar 25, 2026, 10:27 PM

Vulnerability Rating

Custom Algorithm
spread
6.2
impact
5.0
exploitability
5.2
remediation
7.7
relevance
4.7
threat
0.0
urgency
2.9
incentive
0.0

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.