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…
- Published
- Updated
- Reserved
- Assigned by
- hackerone
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.
Exploited in the wild
CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Ubiquiti UniFi OS Path Traversal Vulnerability.
- Added
- 23 Jun 2026
- Fix due (US federal)
- 26 Jun 2026
- Used by ransomware
- Not known
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| hackeroneCNA (assigner) | 3.1 | Critical10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | Critical10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 69.2% · top 0.6% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: active · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 10.0.
Weakness
Affected products
Ubiquiti Inc · UniFi OS Server
- affected < 5.0.8
- affected < 4.0.14
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.11
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.10
- affected < 5.1.10
- affected < 5.1.10
- affected < 5.1.10
- affected < 5.1.10
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
- affected < 5.1.12
References (3)
- https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b (opens in a new tab)
- https://www.pwndefend.com/2026/06/09/cve-2026-34910-exploitation-itw-building-a-botnet-mirai/ (opens in a new tab)third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34909 (opens in a new tab)government-resource
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- CISA KEV catalog (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-34909)Record last updated .