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CVE-2026-34910: Ubiquiti UniFi OS Improper Input Validation Vulnerability

Ubiquiti UniFi OS · in CISA KEV since 2026-06-23

2026-06-23added to KEV

2026-06-26federal remediation due date

87.47%EPSS exploit probability (30 days) 99.7th percentile

10 CRITICALCVSS 3.1

Unknownknown ransomware use

32days from NVD publication to KEV

What it is

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 (CISA)

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.

CWE	CWE-20
CVSS vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`
NVD published	2026-05-22 (Analyzed)

Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2026-34910.json · all KEV CVEs

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