CVE-2026-49186CWE-287

Lack of MQTT Broker Topic Access Control Lists

High · published June 4, 2026

CVSS v4.0
8.6
EPSS
0%
Percentile
39.4
In the wild
Unconfirmed
What it is

The local MQTT broker does not enforce topic-level Access Control Lists (ACLs). This allows any client to subscribe using wildcard characters (# or +) to enumerate hidden network devices or publish rogue control commands.

The record
Technical detail
CVSS v4.0
8.6 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00466 · 39.4th percentile
Weakness
CWE-287 · Improper Authentication
Published
2026-06-04T03:36Z
EPSS history
Timeline
  • 04 JUN 03:36Z
    Lack of MQTT Broker Topic Access Control Lists
    cvelistv5