{"id":"CVE-2026-34909","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-34909","generatedAt":"2026-10-28T14:18:29.708Z","title":"Ubiquiti UniFi OS Path Traversal Vulnerability","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.","published":"2026-05-22T02:16:34.000Z","lastModified":"2026-07-23T16:10:00.000Z","status":"Analyzed","sourceIdentifier":"support@hackerone.com","cvss":{"version":"3.1","score":10,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"},"cwe":["CWE-22"],"affected":["ui/unifi os server","ui/unifi cloud gateway industrial firmware","ui/unifi dream machine firmware","ui/unifi dream machine pro firmware","ui/unifi dream machine special edition firmware","ui/unifi dream machine pro max firmware","ui/enterprise fortress gateway firmware","ui/unifi dream wall firmware","ui/unifi dream router firmware","ui/unifi dream router 7 firmware","ui/unifi express 7 firmware","ui/unifi network video recorder firmware","ui/unifi network video recorder pro firmware","ui/unifi network video recorder instant firmware","ui/enterprise network video recorder firmware","ui/unifi cloud gateway ultra firmware","ui/unifi cloud gateway max firmware","ui/unifi cloud gateway fiber firmware","ui/unifi dream router 5g max firmware","ui/enterprise network video recorder core firmware","ui/unifi cloud key plus firmware","ui/unifi cloudkey firmware","ui/unifi cloudkey enterprise firmware","ui/unifi network video recorder g2 firmware","ui/unifi network video recorder g2 pro firmware","ui/unifi dream machine beast firmware","ui/unas 2 firmware","ui/unas 4 firmware","ui/unas pro firmware","ui/unas pro 4 firmware","ui/unas pro 8 firmware","ui/unifi express firmware"],"epss":{"score":0.68033,"percentile":0.99321,"date":"2026-10-27","history":[{"date":"2026-09-24","score":0.01793,"percentile":0.77446},{"date":"2026-10-25","score":0.68033,"percentile":0.99319}]},"kev":{"listed":true,"dateAdded":"2026-06-23","dueDate":"2026-06-26","knownRansomwareCampaignUse":"Unknown","notes":"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.\nhttps://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-34909"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 26 June 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-10-25T00:00:00.000Z","detail":{"to":0.68033,"from":0.01793,"percentile":0.99319},"summary":"EPSS moved from 1.8% to 68.0% probability of exploitation in the next thirty days."},{"kind":"epss","label":"EPSS jump","at":"2026-09-24T00:00:00.000Z","detail":{"to":0.01793,"from":0.65044,"percentile":0.77446},"summary":"EPSS moved from 65.0% to 1.8% probability of exploitation in the next thirty days."}],"references":[{"url":"https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b","tags":["Patch","Vendor Advisory"],"source":"support@hackerone.com"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34909","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://www.pwndefend.com/2026/06/09/cve-2026-34910-exploitation-itw-building-a-botnet-mirai/","tags":["Exploit","Third Party Advisory"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-34909","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}