CVE intelligence and bounded remediation

CVE-2026-34911 — Ui Unifi Os Server security vulnerability

High CVSS 7.7

A malicious actor with access to the network and low privileges could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to obtain sensitive information.

Severity
High
CVSS
7.7 (3.1)
Published
2026-05-22
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-22

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

Path traversal, unsafe upload, and file handling

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Check exposure

  • Trace untrusted filenames, archive entries, URLs, and path segments into read, write, include, extraction, and upload operations.
  • Identify filesystem roots, mount permissions, symbolic-link behavior, archive handling, and whether uploaded content is web-accessible or executable.
  • Review canonicalization and containment checks across supported operating systems and storage backends.

Remediate safely

  • Generate server-side storage identifiers and resolve paths beneath a fixed root using filesystem-aware containment checks.
  • Reject absolute, parent-relative, alternate-separator, device, link, and archive entries that escape the intended root.
  • Store uploads outside executable or served paths, validate type and size, and use private atomic temporary files.

Authoritative sources

Complete CVE record and remediation plan

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