CVE WatchJul 23, 2026

CVE-2026-34910

Ubiquiti UniFi OS Improper Input Validation Vulnerability

CVSS

10.0

Critical

EPSS

87.5%

p100

KEV

YES

Jun 23, 2026

Exploit Today

0-100

Published: May 22, 2026 · Last modified: Jul 23, 2026 · CWE-20

EPSS · 30d

87.0%EPSS · 30 days87.5%

2026-08-022026-08-30

KEV catalog record

Product

Ubiquiti / UniFi OS

Vulnerability

Ubiquiti UniFi OS Improper Input Validation Vulnerability

Added to KEV

Jun 23, 2026

Remediate by

Jun 26, 2026

Known ransomware use

Summary description

Ubiquiti UniFi OS contains an improper input validation vulnerability which could allow a malicious actor with access to the network to conduct command injection.

Required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Notes

https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-34910

Technical description

A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection.

Official references

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