Ubiquiti UniFi OS Path Traversal Vulnerability
Ubiquiti Inc — UniFi OS Server
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.
10.0
63.9%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Published
- May 22, 2026
- Modified
- Jul 23, 2026
- Added to KEV
- Jun 23, 2026
- Federal patch due
- Jun 26, 2026
CISA 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.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
1 foundWeaponization
Public repositories whose name or description references CVE-2026-34909, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
References
How this class of flaw gets exploited
Frequently asked questions
What is 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.
How severe is CVE-2026-34909?
CVE-2026-34909 has a CVSS base score of 10.0 out of 10 (CVSS 3.1).
Is CVE-2026-34909 actively exploited in the wild?
Yes. CVE-2026-34909 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Jun 23, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2026-34909?
63.9% - meaning FIRST.org's EPSS model estimates a 63.9% probability this vulnerability will be exploited in the wild within 30 days (99% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2026-34909?
We found 1 public GitHub repository referencing CVE-2026-34909, though none matched a known Nuclei template or Metasploit module at last check. Review each one before relying on it - see the proof-of-concept section above.
What type of vulnerability is CVE-2026-34909?
CVE-2026-34909 is classified under CWE-22 (CWE-22 Path Traversal).
Cross-checked against
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