Path Traversal in Ubiquiti Inc Efg

CVE-2026-34909

A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to access an underlying account.

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.023 (81.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: .

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.

References

Frequently asked questions

What is CVE-2026-34909?
CVE-2026-34909 is a critical-severity vulnerability in Ubiquiti Inc Efg, classified under Path Traversal. CVSS score: 10.0/10. Published 2026-05-22.
How severe is CVE-2026-34909?
Critical severity. CVSS v3 base score is 10.0 out of 10.
Is CVE-2026-34909 known to be exploited?
Yes. CVE-2026-34909 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-23), indicating it is being actively exploited.