Ubiquiti UniFi OS Path Traversal Vulnerability

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

• cpe ui/enterprise fortress gateway firmwareversion unspecified
• cpe ui/unifi cloud gateway industrial firmwareversion unspecified
• cpe ui/unifi dream machine firmwareversion unspecified
• cpe ui/unifi dream machine pro firmwareversion unspecified
• cpe ui/unifi dream machine pro max firmwareversion unspecified
• cpe ui/unifi dream machine special edition firmwareversion unspecified
• cpe ui/unifi dream router 7 firmwareversion unspecified
• cpe ui/unifi dream router firmwareversion unspecified
• cpe ui/unifi dream wall firmwareversion unspecified
• cpe ui/unifi express 7 firmwareversion unspecified
• cpe ui/unifi network video recorder firmwareversion unspecified
• cpe ui/unifi os serverversion unspecified
• vendor Ubiquiti UniFi OSversion unspecified

How to fix CVE-2026-34909

• Recommended remediation

  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 Jun 26, 2026.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. May 21, 2026 · Catalog

   Detected

   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.

2. Jun 23, 2026 · CISA KEV

   Known exploited

   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

3. Jun 26, 2026 · CISA KEV

   Remediation due

   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

4. Jul 23, 2026 · Catalog

   Updated

   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.

5. Jul 23, 2026 · NIST NVD

   Updated

   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.

Sources

• CISA KEVConfirmed exploitationCVE-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.gov
• CVE.orgVulnerability recordCVE-2026-34909

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-34909

  30-day exploitation probability 1.8%

  first.org
• NIST NVDVulnerability recordCVE-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.

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-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.

  vulncheck.com

References

• CISA note · community.ui.com
• VulnCheck exploitation evidence · cyble.com
• CISA note · nvd.nist.gov
• VulnCheck exploitation evidence · offseq.com
• US Government Resource · cisa.gov
• CISA note · cisa.gov
• CISA note · cisa.gov
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · greynoise.io
• Exploit · pwndefend.com
• VulnCheck exploitation evidence · recordedfuture.com
• VulnCheck exploitation evidence · x.com

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.