PT-2026-42660 · Ubiquiti · Unifi Os

Published 2026-05-22 · Updated 2026-05-22 · CVE-2026-34911

Positive Technologies (AI Summary)

CVSS v3.1

7.7

High

Base vector

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

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

Description A Path Traversal vulnerability exists in UniFi OS devices, where a malicious actor with network access and low privileges can access internal routes and files on the underlying system without a valid token. This flaw allows for the exposure of sensitive information and can be chained with other issues, such as Improper Access Control and Command Injection, to achieve pre-authentication Remote Code Execution (RCE), which is the ability to execute arbitrary commands on a target machine over a network without prior authentication.

Recommendations Update affected systems to the latest available version.

Fix

RCE

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2026-34911

Affected Products

Unifi Os

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-34911 · Security 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/2057783185723764811 · Twitter Post
• https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b · Note
• https://twitter.com/carlos_crowsec/status/2057808708625703147 · Twitter Post