Ubiquiti · UniFi OS
CVE-2026-34908
Ubiquiti UniFi OS Improper Access Control Vulnerability
What it is
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.
CISA: Ubiquiti UniFi OS contains an improper access control vulnerability which could allow a malicious actor with access to the network to make unauthorized changes to the system.
What to do
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.
Deadline for US federal agencies: June 26, 2026
More exploited flaws from Ubiquiti
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Jun 23, 2026 | Path Traversal | UniFi OS | Critical 10.0 | 68% |
| Jun 23, 2026 | Improper Input Validation | UniFi OS | Critical 10.0 | 90% |
| Apr 15, 2022 | Command Injection | AirOS | Critical 9.8 | 40% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.