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CVE-2026-34909: Ubiquiti UniFi OS Path Traversal Vulnerability

criticalknown exploitedCVE-2026-34909
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Ubiquiti UniFi OS contains a path traversal vulnerability which could allow a malicious actor with access to the network to access files on the underlying system that could be manipulated to access an underlying account.

CSIRTS triage

vendor: Ubiquitiproduct: UniFi OSPath traversal
What
A path traversal vulnerability could allow access to sensitive files on the system.
Who is affected
Malicious actors with access to the network using Ubiquiti UniFi OS.
Urgency
Remediation is critical due to the potential for exploitation and the severity of the vulnerability.
Action
Update to the latest version of Ubiquiti UniFi OS.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-06-23
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-34909

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-34909coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Ubiquiti UniFi OS

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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