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CVE-2026-34910

CriticalPublished

Ubiquiti UniFi OS Improper Input Validation Vulnerability

Published: May 22, 2026
Updated: Jun 24, 2026
Assigning CNA: hackerone
Evidence observed: Jun 23, 2026

Primary CVSS

10.0/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS probability estimate

87.5%

High · next 30 days

Percentile: 99.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

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.

Sources

CVE-2026-34910-unifi-pocPoC
Proof-of-concept exploit for UniFi OS CVE-2026-34910 auth bypass enabling command injection/RCE, and CVE-2026-34909 path traversal for arbitrary file reads.
CVE-2026-34908-checkScanner
Safely detect whether a UniFi OS Server is vulnerable to CVE-2026-34908

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