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)

Published 2026-05-22 · last modified 2026-07-23.

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.

EPSS exploit prediction

EPSS: 0.014 (72.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.014 · change: +0.002

Affected products

Ubiquiti Inc Unifi OS Server — versions 0
Ui Unifi OS Server

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab… (Patch, Vendor Advisory)

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.