PT-2026-42658 · Ubiquiti · Unifi Os

Published 2026-05-22 · Updated 2026-05-22 · CVE-2026-34909

Positive Technologies (AI Summary)

CVSS v3.1

10

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions UniFi OS (affected versions not specified)

Description A network-based actor can exploit a Path Traversal flaw to access files on the underlying system. Path Traversal is a technique that allows an attacker to read or write files outside the intended directory. These accessed files could be manipulated to gain access to an underlying account.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2026-34909

Affected Products

Unifi Os

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-34909 · Security Note
• https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b · Note
• https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b?notification=5e3e9a1d-963d-4f08-849b-8ef2add818e0 · Reddit Post
• https://twitter.com/CVEnew/status/2057783189867798893 · Twitter Post