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Weekly Signal
Live intelligence Updated 19 Aug 2026 · 20:27 UTC

Ubiquiti, Ui · UniFi OS, Enterprise Fortress Gateway Firmware, Enterprise Network Video Recorder Core Firmware +30 more

CVE-2026-34909

Ubiquiti UniFi OS Path Traversal Vulnerability

Recommended action

Validate affected assets and exposure now, then remediate on an accelerated schedule. 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.

View response plan
CVSS10.0
EPSS63.9%
KEVYes
ExploitationConfirmed exploitation
RemediationExplicit patch identified ↓

Assessment

Why it matters

CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 63.9%; technical severity is CVSS 10.0.

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.

Who should care

  • Teams operating UniFi OS, Enterprise Fortress Gateway Firmware, Enterprise Network Video Recorder Core Firmware +30 more
  • Vulnerability and exposure management teams
  • Security operations teams monitoring exploitation activity

Response plan

What I would do

  1. Confirm whether UniFi OS, Enterprise Fortress Gateway Firmware, Enterprise Network Video Recorder Core Firmware +30 more is present in the environment.
  2. Identify affected versions and establish whether vulnerable services are exposed or reachable.
  3. 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.
  4. Review relevant security telemetry for evidence of attempted or successful exploitation.
  5. Document the remediation decision and track it to verified completion.

Treatment intelligence

Remediation intelligence

Not yet verified

Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.

Verification noteAutomated link verification has not completed for this guidance yet.

Patch

Required Action

Technical details

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE
CWE-22
Affected versions
Ubiquiti UniFi OS; Ui Enterprise Fortress Gateway Firmware (End Excluding 5.1.12); Ui Enterprise Network Video Recorder Core Firmware (End Excluding 5.1.12); Ui Enterprise Network Video Recorder Firmware (End Excluding 5.1.12); Ui Unas 2 Firmware (End Excluding 5.1.10); Ui Unas 4 Firmware (End Excluding 5.1.10); Ui Unas Pro 4 Firmware (End Excluding 5.1.10); Ui Unas Pro 8 Firmware (End Excluding 5.1.10)
Fixed versions
Ui Enterprise Fortress Gateway Firmware (Fixed from 5.1.12); Ui Enterprise Network Video Recorder Core Firmware (Fixed from 5.1.12); Ui Enterprise Network Video Recorder Firmware (Fixed from 5.1.12); Ui Unas 2 Firmware (Fixed from 5.1.10); Ui Unas 4 Firmware (Fixed from 5.1.10); Ui Unas Pro 4 Firmware (Fixed from 5.1.10); Ui Unas Pro 8 Firmware (Fixed from 5.1.10); Ui Unas Pro Firmware (Fixed from 5.1.10)
Published
22 May 2026
Attack vector
Network
Privileges required
None
User interaction
None

Signal timeline

  1. CVE published
  2. Added to CISA KEV
  3. Latest EPSS score: 63.9%
  4. Signal calculated at 81

External references

Live public intelligence This assessment combines public-source evidence. Validate the affected product, version and exposure against your own environment before making a risk decision.