EUVD-2026-41400
GHSA-hh99-693c-cjm3
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Network vector unauthenticated, but 'certain network configurations' requirement raises attack complexity to AC:H; improper access control yields total control over device (C/I/A High).
Primary rating from Vendor (hackerone).
CVSS VectorNVD
Lifecycle Timeline
6DescriptionNVD
A malicious actor with access to the network and under certain network configurations could exploit an Improper Access Control vulnerability found in certain devices running UniFi OS to make unauthorized changes to such UniFi OS devices.
AnalysisAI
Unauthorized configuration changes on Ubiquiti UniFi OS gateway devices (Dream Machines, Dream Routers, Cloud Gateways, Enterprise Firewall Core, Enterprise Fortress Gateway, Dream Wall and Express 7) are possible through an improper access control flaw that, under certain network configurations, lets a network-adjacent attacker alter device settings without proper authorization. Ubiquiti has released version 5.1.19 to fix the issue via Security Advisory Bulletin 066. There is no public exploit identified at time of analysis, EPSS probability is low (0.22%), and CISA SSVC records exploitation status as none, but the total technical impact and 9.8 CVSS rating make this a high-priority patch for exposed gateways.
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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