CVE-2026-7415: Open MQTT orchestration without read/write ACLs in Yarbo robot firmware

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-07 · updated 2026-10-26
Weakness: CWE-306

Description

The MQTT broker embedded in Yarbo firmware v2.3.9 is configured to allow anonymous connections with no topic-level read or write ACLs. Any host on the same network can subscribe to sensitive telemetry topics or publish control messages directly to the robot without authentication or authorization of any kind.

Affected products

Yarbo Lawn Mower Firmware: 2.3.9
Yarbo Lawn Mower Pro Firmware: 2.3.9

References

https://github.com/Bin4ry/yarbo-nat-in-my-back-yard
https://takeonme.org/gcves/GCVE-1337-2026-00000000000000000000000000000000000000000000000000111111111100111111111110000000000000000000000000000000000000000000000000000001001
https://github.com/Bin4ry/yarbo-nat-in-my-back-yard

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