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.
Why It Matters
Analysis dossierWhy It Matters
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.
Immediate Attention
Yes
Unknown
Risk basis: CISA KEV exploitation signal; SOC ecosystem technology relevance; CRITICAL severity; Known exploitation signal from CISA KEV or ransomware metadata
Affected Products & Remediation
32 source-backed products- ui unifi os server · < 5.0.8 · NVD CPE · Source
- ui unifi cloud gateway industrial firmware · < 5.1.12 · NVD CPE · Source
- ui unifi dream machine firmware · < 5.1.12 · NVD CPE · Source
- ui unifi dream machine pro firmware · < 5.1.12 · NVD CPE · Source
- ui unifi dream machine special edition firmware · < 5.1.12 · NVD CPE · Source
- ui unifi dream machine pro max firmware · < 5.1.12 · NVD CPE · Source
- ui enterprise fortress gateway firmware · < 5.1.12 · NVD CPE · Source
- ui unifi dream wall firmware · < 5.1.12 · NVD CPE · Source
- ui unifi dream router firmware · < 5.1.12 · NVD CPE · Source
- ui unifi dream router 7 firmware · < 5.1.12 · NVD CPE · Source
- ui unifi express 7 firmware · < 5.1.12 · NVD CPE · Source
- ui unifi network video recorder firmware · < 5.1.12 · NVD CPE · Source
- ui unifi network video recorder pro firmware · < 5.1.12 · NVD CPE · Source
- ui unifi network video recorder instant firmware · < 5.1.12 · NVD CPE · Source
- ui enterprise network video recorder firmware · < 5.1.12 · NVD CPE · Source
- ui unifi cloud gateway ultra firmware · < 5.1.12 · NVD CPE · Source
- ui unifi cloud gateway max firmware · < 5.1.12 · NVD CPE · Source
- ui unifi cloud gateway fiber firmware · < 5.1.12 · NVD CPE · Source
- ui unifi dream router 5g max firmware · < 5.1.12 · NVD CPE · Source
- ui enterprise network video recorder core firmware · < 5.1.12 · NVD CPE · Source
- ui unifi cloud key plus firmware · < 5.1.12 · NVD CPE · Source
- ui unifi cloudkey firmware · < 5.1.12 · NVD CPE · Source
- ui unifi cloudkey enterprise firmware · < 5.1.12 · NVD CPE · Source
- ui unifi network video recorder g2 firmware · < 5.1.12 · NVD CPE · Source
- ui unifi network video recorder g2 pro firmware · < 5.1.12 · NVD CPE · Source
- ui unifi dream machine beast firmware · < 5.1.11 · NVD CPE · Source
- ui unas 2 firmware · < 5.1.10 · NVD CPE · Source
- ui unas 4 firmware · < 5.1.10 · NVD CPE · Source
- ui unas pro firmware · < 5.1.10 · NVD CPE · Source
- ui unas pro 4 firmware · < 5.1.10 · NVD CPE · Source
- ui unas pro 8 firmware · < 5.1.10 · NVD CPE · Source
- ui unifi express firmware · < 4.0.14 · NVD CPE · Source
Vendor or catalog guidance (source)
- CISA KEV: 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.
Known exploitation (source facts)
Only what a source states. Unknown means no source has said either way; it is not "not exploited".
- CISA KEV
- Listed
- Exploited (source statement)
- Yes
- Publicly disclosed (source)
- Unknown
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.
Suggested hunting (rule-based inference)
SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.
Matched kev-network-exposure (CVSS AV:N, CISA KEV Listed); path-traversal (CWE-22)
Exposure
- Identify assets with the exact CVE and confirm the affected product/version against the advisory.Telemetry: DeviceTvmSoftwareVulnerabilities · KEV listing raises urgency, but inventory is needed to establish local exposure. · Rule kev-network-exposure
- Locate affected deployments and the path-handling endpoint named by the advisory.Telemetry: Application access logs · The affected path must come from the source, not the CWE alone. · Rule path-traversal
Exploitation evidence
- Review relevant edge or application access logs for unusual requests around the advisory window.Telemetry: CommonSecurityLog · Log review is a hunting hypothesis; KEV listing alone does not show local exploitation. · Rule kev-network-exposure
Show more (2)
Exploitation evidence
- Review requests to that endpoint for traversal encodings and unusual file responses.Telemetry: Application access logs · Such patterns are a hypothesis to validate against normal traffic. · Rule path-traversal
Response
- Recheck the affected assets after the source-stated mitigation or update is applied.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies local remediation. · Rule kev-network-exposure
CISA KEV Record
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.
Change History & Source Data
— No recorded material change
- CNA / source
- support@hackerone.com
- Record status · verification
- UPDATED · CISA KEV confirmed
- CPE
- cpe:2.3:a:ui:unifi_os_server:*:*:*:*:*:*:*:*, cpe:2.3:o:ui:unifi_cloud_gateway_industrial_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:ui:unifi_cloud_gateway_industrial:-:*:*:*:*:*:*:*, cpe:2.3:o:ui:unifi_dream_machine_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:ui:unifi_dream_machine:-:*:*:*:*:*:*:*, cpe:2.3:o:ui:unifi_dream_machine_pro_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:ui:unifi_dream_machine_pro:-:*:*:*:*:*:*:*, cpe:2.3:o:ui:unifi_dream_machine_special_edition_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:ui:unifi_dream_machine_special_edition:-:*:*:*:*:*:*:*, cpe:2.3:o:ui:unifi_dream_machine_pro_max_firmware:*:*:*:*:*:*:*:*
Evidence & Provenance
Linked by the query's stored exact CVE association. Review required tables and validation status before use.
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2026-34909"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc