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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 underlying system that could be manipulated to access an underlying account.

Scores

10.0
CVSS 10.0 out of 10, critical severity.
1.8%
EPSS 1.8% chance of exploitation in the next 30 days.

The facts

Published
22 May 2026
Last changed
23 July 2026
NVD status
Analyzed
Severity
Critical, CVSS 10.0 out of 10 (version 3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
Affects
  • 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
Known exploited
Yes. CISA added it to the Known Exploited Vulnerabilities catalogue on 23 June 2026.
EPSS
1.8% chance of exploitation activity in the next 30 days (percentile 78).

Is there a Securelyn advisory?

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References