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CVE-2026-54402 is a critical improper input validation vulnerability in UniFi OS that allows a remote attacker with network access and low privileges to trigger command injection on the underlying host device. The flaw stems from insufficient validation or sanitization of attacker-controlled input before it is used in a context that can invoke system commands. Successful exploitation enables execution of arbitrary commands on the host operating environment. Reported affected versions include UniFi OS 5.1.15 and earlier across multiple UniFi OS platforms, with some reporting also indicating exposure on related UniFi OS-based deployments until the fixed release.
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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.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Critical UniFi OS vulnerability caused by insufficient input validation, allowing a network-access attacker to execute commands on the host system.
A critical improper input validation flaw in Ubiquiti UniFi OS that enables remote low-privileged attackers to achieve command injection on the host device.
A critical SSRF vulnerability affecting multiple Ubiquiti UniFi OS devices that may allow a low-privileged network attacker to achieve privilege escalation.
A critical improper input validation vulnerability in UniFi OS that can lead to command injection on the host device.
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.