Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since June 23, 2026.
CVE-2026-34909
Ubiquiti UniFi OS Path Traversal Vulnerability
Added to KEV June 23, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2026-34909
- CWE
- CWE-22
- Affected products
- UniFi OS · Ubiquiti UniFi OS · Ubiquiti
What happened
Ubiquiti UniFi OS contains a path traversal vulnerability which could allow a malicious actor with access to the network to access files on the underlying system that could be manipulated to access an underlying account.
What it means for your business
Ubiquiti UniFi OS is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-34909). Ubiquiti UniFi OS contains a path traversal vulnerability which could allow a malicious actor with access to the network to access files on the underlying system that could be manipulated to access an underlying account. CISA remediation due date: 2026-06-26. If you need help checking exposure, call (864) 335-9223.
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.
CISA due date: June 26, 2026
Sources
Related briefs
Ubiquiti UniFi OS Improper Input Validation Vulnerability
Ubiquiti UniFi OS is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-34910). Ubiquiti UniFi OS contains an improper input validation vulnerability which could allow a malicious actor with access to the network to conduct command injection. CISA remediation due date: 2026-06-26. If you need help checking exposure, call (864) 335-9223.
Ubiquiti UniFi OS Improper Access Control Vulnerability
Ubiquiti UniFi OS is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-34908). 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. CISA remediation due date: 2026-06-26. If you need help checking exposure, call (864) 335-9223.
Need help patching?
PremierePC monitors KEV alerts for managed clients and helps teams prioritize remediation before attackers do.