What is CVE-2026-33000?

CVE-2026-33000 is a critical-severity vulnerability in Ubiquiti Inc Unifi Os Server, classified under Improper Input Validation. CVSS score: 9.1/10. Published 2026-05-22.

How severe is CVE-2026-33000?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Improper input validation in Ubiquiti Inc Unifi Os Server

CVE-2026-33000

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.001 (19.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Ubiquiti Inc Unifi Os Server — versions 0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

support@hackerone.com

Frequently asked questions

What is CVE-2026-33000?: CVE-2026-33000 is a critical-severity vulnerability in Ubiquiti Inc Unifi Os Server, classified under Improper Input Validation. CVSS score: 9.1/10. Published 2026-05-22.
How severe is CVE-2026-33000?: Critical severity. CVSS v3 base score is 9.1 out of 10.