CVE-2026-34909

Deferred
Published: 22 May 2026, 00:43
Last modified:24 Jun 2026, 03:56

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
10 CRITICAL
v3.1 (cve.org)
EPSS Score
1.82% LOW
2% probability +0.93%
KEV
Listed
CISA
1 listing
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

22 May 2026, 00:43
Published
Vulnerability first disclosed
23 Jun 2026, 00:00
Added to CISA KEV
Ubiquiti UniFi OS Path Traversal Vulnerability
24 Jun 2026, 03:56
Last Modified
Vulnerability information updated
26 Jun 2026, 00:00
CISA 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 each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Description

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.

CVSS Metrics

  • v3.1•CRITICAL•Score: 10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 1.82%• Percentile: 76%

Techniques & Countermeasures

  • CWE-22•Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

    The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Affected Systems

  • ubiquiti inc•efg

    < 5.1.12

  • ubiquiti inc•envr

    < 5.1.12

  • ubiquiti inc•envr-core

    < 5.1.12

  • ubiquiti inc•express

    < 4.0.14

  • ubiquiti inc•express 7

    < 5.1.12

  • ubiquiti inc•ucg-fiber

    < 5.1.12

  • ubiquiti inc•ucg-industrial

    < 5.1.12

  • ubiquiti inc•ucg-max

    < 5.1.12

  • ubiquiti inc•ucg-ultra

    < 5.1.12

  • ubiquiti inc•uck

    < 5.1.12

  • ubiquiti inc•uck-enterprise

    < 5.1.12

  • ubiquiti inc•uckp

    < 5.1.12

  • ubiquiti inc•udm

    < 5.1.12

  • ubiquiti inc•udm-beast

    < 5.1.11

  • ubiquiti inc•udm-pro

    < 5.1.12

  • ubiquiti inc•udm-pro-max

    < 5.1.12

  • ubiquiti inc•udm-se

    < 5.1.12

  • ubiquiti inc•udr

    < 5.1.12

  • ubiquiti inc•udr-5g

    < 5.1.12

  • ubiquiti inc•udr7

    < 5.1.12

  • ubiquiti inc•udw

    < 5.1.12

  • ubiquiti inc•unas-2

    < 5.1.10

  • ubiquiti inc•unas-4

    < 5.1.10

  • ubiquiti inc•unas-pro

    < 5.1.10

  • ubiquiti inc•unas-pro-4

    < 5.1.10

  • ubiquiti inc•unas-pro-8

    < 5.1.10

  • ubiquiti inc•unifi os server

    < 5.0.8

  • ubiquiti inc•unvr

    < 5.1.12

  • ubiquiti inc•unvr-g2

    < 5.1.12

  • ubiquiti inc•unvr-g2-pro

    < 5.1.12

  • ubiquiti inc•unvr-instant

    < 5.1.12

  • ubiquiti inc•unvr-pro

    < 5.1.12

References (3)