CVE intelligence and bounded remediation
CVE-2026-54403 — Ui Unifi Os Server security vulnerability
High
CVSS 8.6
A malicious actor with access to the network could exploit a Path Traversal vulnerability found in certain devices running UniFi OS to bypass authentication of such UniFi OS devices or instances.
- Severity
- High
- CVSS
- 8.6 (3.1)
- Published
- 2026-07-02
- CISA KEV
- Not currently listed
- Ecosystem
- software/application
- Weaknesses
- CWE-22
Affected products
- ui / unifi_os_server
- 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
- ui / unifi_dream_machine_beast_firmware
Showing 6 representative product identities from 32 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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