CVE intelligence and bounded remediation

CVE-2026-34908 — Ubiquiti UniFi OS Improper Access Control Vulnerability

Critical CVSS 10 CISA KEV

A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi OS devices to make unauthorized changes to the system.

Severity
Critical
CVSS
10 (3.1)
Published
2026-05-22
CISA KEV
Known exploited
Ecosystem
software/application
Weaknesses
CWE-284

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

Authorization bypass, IDOR, and cross-tenant access

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Check exposure

  • Map object and action authorization checks across API, UI, batch, import/export, and background-job paths.
  • Identify tenant, ownership, role, and policy boundaries for affected resources and administrative operations.
  • Use synthetic fixtures to compare intended access matrices without accessing another user's real data.

Remediate safely

  • Enforce server-side authorization at each resource access and state transition using the authenticated principal and trusted tenant context.
  • Scope data queries by tenant and ownership; treat client-supplied identifiers, roles, and policy claims as untrusted.
  • Add deny-by-default policy tests for horizontal and vertical access across every affected transport.

Authoritative sources

Complete CVE record and remediation plan

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