Actively exploited in the wild
Ubiquiti UniFi OS Improper Access Control Vulnerability
Ubiquiti — UniFi OS · Listed in the CISA KEV since 2026-06-23. This indicates confirmed attacks in production environments.
Required action: 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.
CVE-2026-34908
CriticalCVSS 10.0KEVExploitation Probability (EPSS)
High risk79th percentile — higher than 79% of all known CVEs
Summary
There is an Improper Access Control vulnerability in UniFi OS devices that can be exploited by a malicious actor with network access to make unauthorized changes to the system.
Risk Assessment
The organization may be exposed to unauthorized modifications of the system, potentially leading to data loss or integrity breaches.
Recommendation
It is recommended to monitor network access and implement appropriate security measures to mitigate the risk of this vulnerability.
Original NVD description (English source)
A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi OS devices to make unauthorized changes to the system.