CISA placed three severe Ubiquiti UniFi OS vulnerabilities and one critical Lantronix command injection flaw into its Known Exploited Vulnerabilities catalog on June 23, 2026, after confirming active attacks. Federal agencies must apply patches or mitigations within three days under BOD 26-04, while Bishop Fox demonstrated the Ubiquiti issues can be chained for full remote code execution and released a free detection script.
Security researchers at Bishop Fox later showed the flaws can be combined to reach full remote code execution with elevated privileges on affected UniFi OS devices.
CISA has not shared any details about the observed exploitation of any of the four flaws, while the "use in ransomware campaigns" flag was set to "Unknown" for all of them.
Organizations running UniFi OS should prioritize the May patches immediately, as chaining these three flaws grants unauthenticated root access with minimal effort.
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