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Exploited vulnerability · CISA KEV

Is CVE-2026-34910 exploited? Yes: in CISA KEV since 23 Jun 2026

Gociux · Ubiquiti UniFi OS · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-34910, Ubiquiti UniFi OS Improper Input Validation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 23 Jun 2026, 32 days after it was published. It affects Ubiquiti UniFi OS. If you run it, CISA's required action is: 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.

exploitedYesCISA KEV · 23 Jun 2026
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity10CVSS 3.1 · critical
US federal due26 Jun 2026BOD 22-01 deadline

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.

VendorUbiquiti (4 exploited CVEs in KEV)
ProductUniFi OS
VulnerabilityUbiquiti UniFi OS Improper Input Validation Vulnerability
WeaknessCWE-20
Published22 May 2026
Added to KEV23 Jun 2026
Reported by (CNA)hackerone

What to do

  1. Check whether you run it. Look for UniFi OS in your asset inventory, including appliances and cloud images. Stack check lists every exploited Ubiquiti CVE at once.
  2. Apply the fix. 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.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 22 May 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for Ubiquiti.

Other exploited CVEs in UniFi OS

References

Questions

Is CVE-2026-34910 being exploited?

Yes. CISA added CVE-2026-34910 to the Known Exploited Vulnerabilities catalog on 23 Jun 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-34910 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2026-34910?

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. Check Ubiquiti's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected UniFi OS and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in June 2026 · Ubiquiti scorecard · act-now radar.

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