Intel

CVE-2026-33000

unifi_os_server: Improper Input Validation (CVE-2026-33000)

criticalEPSS 1.4%

Affected

  • ui/unifi_os_server lt *..5.0.8

Description

A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection.

Source: BSI CSAFBSI WID Portalcvelistv5NVD (NIST)CVE.org (MITRE)ENISA EUVD

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

uiunifi_os_server
5.0.8fixed from 5.0.8

Metrics

XIEM Effective CVSS
9.1
Source: nvd-v3
EPSS percentile
72.5 %
High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
—
Show all metrics
Severity
critical
Priority score
106.19
Exploit maturity
no public PoC known
CVSS v3
9.1
EPSS score
1.4 %
Moderate — model estimates 1-10% exploitation likelihood.
Published
2026-05-22 02:16 UTC
CWE
CWE-20

Weakness classes (CWE)

  • CWE-20Class

    Improper Input Validation

    The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

    cwe.mitre.org →

References & sources

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

  1. CVE Translated2026-07-23 16:10 UTC· nvd@nist.gov
    • Translation: Title: UniFi OS Server de Ubiquiti, Description: Un actor malicioso con acceso a la red y privilegios elevados podría explotar una vulnerabilidad de validación de entrada incorrecta encontrada en dispositivos UniFi OS para ejecutar una inyección de comandos.
  2. Initial Analysis2026-06-24 15:10 UTC· nvd@nist.gov
    • CPE Configuration: OR *cpe:2.3:a:ui:unifi_os_server:*:*:*:*:*:*:*:* versions up to (excluding) 5.0.8
    • Reference Type: HackerOne: https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b Types: Patch, Vendor Advisory

Linked advisories