Network-Adjacent Attackers Can Inject Commands into Ubiquiti UniFi OS Through an Input Validation Flaw; CISA's June 26th KEV Remediation Window Has Closed for Covered Entities

Last refreshed2026-09-27

Status: KEV | Advisory ID: CVE-2026-34910

Key Details

CVE	CVE-2026-34910
Vulnerability Name	Ubiquiti UniFi OS Improper Input Validation Vulnerability
Affected products	Ubiquiti UniFi OS
Exploitation status	Listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation.
Classified as	CWE-20 (Improper Input Validation)
KEV listing	Added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-06-23.
Exploitation prediction (EPSS)	45.77% probability of exploitation in the next 30 days (99% percentile) -- FIRST.org's EPSS model.
Federal remediation deadline	2026-06-26 (CISA KEV, Binding Operational Directive).

Affected Products, Subsystems & Sectors

Vendor	Product	Affected Versions	Patch Status
Ubiquiti	UniFi OS

Vendor

Product

Affected Versions

Patch Status

Ubiquiti

UniFi OS

Subsystems	General OT
Sectors	Multiple

What to Know

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

What to Do

Monitor Ubiquiti's web page for any future patch releases.

References

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-34910
CVE	https://www.cve.org/CVERecord?id=CVE-2026-34910

Source

Reference

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-34910

CVE

https://www.cve.org/CVERecord?id=CVE-2026-34910

KEV Required Action

Field	Value
KEV Link	https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Date Added to KEV	2026-06-23
Required Action Due Date	2026-06-26
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.

Field

Value

KEV Link

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Date Added to KEV

2026-06-23

Required Action Due Date

2026-06-26

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.