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CVE-2026-54402: unifi os server vulnerability
CVE-2026-54402: critical vulnerability affecting unifi os server. Check CVSS, KEV status, business impact and recommended administrator actions.
- CVSS
- 9.9 CRITICAL
- EPSS
- 76.98%
- Known exploited
- not in KEV
- Product
- unifi os server
What is known
A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi OS to execute a Command Injection on the host device.
Business impact
Successful exploitation of CVE-2026-54402, a critical vulnerability (CVSS 9.9) affecting unifi os server, may affect the confidentiality, integrity or availability of the vulnerable environment. The exact impact depends on the installed version, exposed interfaces and deployment configuration.
Recommended administrator action
Confirm whether unifi os server is present and compare installed versions with the vendor advisory and NVD record. Apply the vendor patch or documented mitigation; until remediation is complete, reduce exposure of affected interfaces, review relevant logs and monitor for indicators of exploitation. DataHouse can support version verification, managed patching, network exposure reduction, log review and backup validation for dedicated, cloud and colocated environments.