CVE-2026-34910: critical vulnerability in Ubiquiti Inc EFG
Published · Updated
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Patch now. It under exploitation confirmed by CISA and has a working public exploit.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
A person with network access to UniFi OS devices can inject malicious commands because the system doesn't properly check input, allowing them to run unauthorized code on the device.
CWE-20 Improper Input Validation in UniFi OS permits command injection attacks from network-adjacent threat actors. Exploitation requires network access; attackers can bypass input sanitization to execute arbitrary commands with device privileges.
The full analysis of this CVE is available in Portuguese →
In the same product, most dangerous first.