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CVE-2026-55116 is a critical improper access control vulnerability in certain devices running Ubiquiti UniFi OS. Under specific network configurations, a remote attacker with network access can exploit insufficient authorization controls to make unauthorized changes to affected UniFi OS devices. Reported affected versions include UniFi OS 5.1.15 and earlier on multiple UniFi OS platforms, with some reporting also noting exposure across related gateway and console hardware families. The flaw is described as remotely exploitable and enables unauthorized modification of device state or configuration without intended access restrictions being properly enforced.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Critical UniFi OS vulnerability caused by insufficient access control, allowing a network-access attacker to make unauthorized changes on affected devices.
A critical improper access control vulnerability in Ubiquiti UniFi OS that can allow remote unauthenticated attackers to make unauthorized changes under certain network configurations.
A critical improper access control vulnerability affecting certain Ubiquiti UniFi OS devices that allows unauthorized changes under specific network conditions.
A critical improper access control vulnerability in UniFi OS that can allow unauthorized changes to certain devices by an attacker with network access.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.