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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 underlying host device. The issue affects UniFi OS and UniFi OS Server deployments, including multiple UniFi hardware platforms, in versions 5.1.15 and earlier, and is fixed in version 5.1.19. Available reporting indicates the flaw is present in user-facing administrative APIs and can be exploited remotely by an attacker who has network access and only low-privileged authenticated access. No user interaction is required. Successful exploitation allows attacker-controlled input to reach command execution paths on the host system, resulting in arbitrary command execution with high impact to confidentiality, integrity, and availability.
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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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Critical command injection vulnerability in Ubiquiti UniFi OS caused by improper input validation in user-facing administrative APIs, allowing a remote authenticated attacker with minimal privileges to execute commands without user interaction.
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.
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.