Detections
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CVE-2026-34909

critical

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.

References

https://www.securityweek.com/critical-ubiquiti-vulnerabilities-in-attackers-crosshairs/

https://www.bleepingcomputer.com/news/security/cisa-warns-of-max-severity-ubiquiti-flaws-exploited-in-attacks/

https://securityaffairs.com/194142/security/u-s-cisa-adds-ubiquiti-unifi-os-and-lantronix-eds5000-plugin-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.cisa.gov/news-events/alerts/2026/06/23/cisa-adds-four-known-exploited-vulnerabilities-catalog

https://www.bleepingcomputer.com/news/security/critical-unifi-os-bug-lets-hackers-gain-root-without-authentication/

https://www.bleepingcomputer.com/news/security/ubiquiti-patches-three-max-severity-unifi-os-vulnerabilities/

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34909

https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b

Details

Source: Mitre, NVD

Published: 2026-05-22

Updated: 2026-06-24

Known Exploited Vulnerability (KEV)

CVSS v3

Base Score: 10

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.0002