CVE intelligence and bounded remediation

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

Critical CVSS 10 CISA KEV

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.

Severity
Critical
CVSS
10 (3.1)
Published
2026-05-22
CISA KEV
Known exploited
Ecosystem
software/application
Weaknesses
CWE-20

Affected products

  • ui / unifi_os_server
  • ui / unifi_cloud_gateway_industrial_firmware
  • ui / unifi_dream_machine_firmware
  • ui / unifi_dream_machine_pro_firmware
  • ui / unifi_dream_machine_special_edition_firmware
  • ui / unifi_dream_machine_pro_max_firmware

Showing 6 representative product identities from 31 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Command, code, expression, and template injection

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Check exposure

  • Trace untrusted values to process execution, interpreters, evaluators, template engines, dynamic imports, and administrative scripting features.
  • Determine whether the affected path is reachable across each trust boundary and which service account or host privilege it inherits.
  • Review configuration for optional execution features, unsafe compatibility modes, and shell invocation.

Remediate safely

  • Replace string-built commands or evaluated code with fixed operations and structured argument APIs that do not invoke a shell.
  • Use strict allowlists for operation identifiers and reject unexpected input before it reaches any interpreter.
  • Update the affected component and add inert regression tests covering metacharacters, encoding variants, and alternate request paths.

Authoritative sources

Complete CVE record and remediation plan

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