Summary
generated automatically from NVD dataCVE-2026-34909 is a path traversal flaw (CWE-22) in UniFi OS devices, including UniFi OS Server and several Dream Machine, Dream Wall, Cloud Gateway Industrial and Enterprise Fortress Gateway firmware. An attacker with network access can reach files on the underlying system and manipulate them to gain access to an underlying account. It is rated CRITICAL with a CVSS v3.1 score of 10.0, and CISA lists it in its KEV catalog as actively exploited.
NVD 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.
⚠️ Actively exploited — CISA KEV
This CVE was added to CISA's Known Exploited Vulnerabilities catalog on 2026-06-23. It is confirmed exploited in the wild and must be patched as a priority.
Remediation deadline (US federal agencies): 2026-06-26
EPSS · FIRST.org
1.8%probability of exploitation in the next 30 days
Higher than 78% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-16, recomputed daily by FIRST.org.
In-depth analysis on cveo.tech
We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.
CVSS v3.1 Score
Information
- Published
- 22 mai 2026
- Updated
- 23 juil. 2026
- Status
- Analyzed
- Source
- support@hackerone.com
Affected products
Weaknesses (CWE)
References (3)
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34909US Government Resource
- https://www.pwndefend.com/2026/06/09/cve-2026-34910-exploitation-itw-building-a-botnet-mirai/ExploitThird Party Advisory
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