CVE-2026-33000 | BDVDB-2026-334532 Detail

UbiquitiUniFi OS Server

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

Weaknesses#

CWE-20 Improper Input Validation

References#

https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b

Exploit#

No public exploit known

History#

Version 12026-05-22Record published in the CVE List.
Version 22026-05-23Most recent update recorded in the CVE List.

Published

Published: 2026-05-22
Last modified: 2026-05-23

Vendor information

Vendor: Ubiquiti
Product: UniFi OS Server

All Ubiquiti vulnerabilities

Score

9.1 Critical

EPSS

1.2%, Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 69.6.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Improper Input Validation

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 5.0.8
Fixed
5.0.8

Scoring System

CVSS v4.0

Not available

CVSS v3.1

9.1 Critical

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	High
User Interaction	None
Scope	Changed
Confidentiality	High
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).