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CVE-2026-54402 is a critical improper input validation vulnerability in Ubiquiti UniFi OS that can lead to command injection on the host device. According to the provided content, a malicious actor with network access and low privileges can exploit insufficient validation of attacker-controlled input to execute commands on the underlying host. The issue is described as remotely exploitable, requires no user interaction, and affects UniFi OS version 5.1.15 and earlier; some provided sources also describe affected UniFi OS versions as 5.1.15 through 5.1.18 and earlier. The vulnerable function or endpoint is not identified in the provided material.
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No public exploit code observed for this vulnerability.
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9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
One of six additional critical-severity vulnerabilities patched by Ubiquiti affecting UniFi Talk, UniFi Access, UniFi Protect, UniFi OS Server, and various Ubiquiti devices.
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.