What is 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.
The record classifies CVE-2026-33000 under weakness class CWE-20. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs high-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 159 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.1 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - EPSS (FIRST)
- 1.4% probability of exploitation in the next 30 days, higher than 72.4% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 7.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-05-22, last modified 2026-05-23
Is CVE-2026-33000 being exploited?
It currently carries a trending score of 23 in the Threadlinqs vulnerability feed.
Affected products and versions
- Ubiquiti Inc: UniFi OS Server
How to fix CVE-2026-33000
No vendor patch reference has been recorded for CVE-2026-33000 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-33000
2 tracked threats in the Threadlinqs corpus reference CVE-2026-33000, either in the campaign’s CVE list or as an indicator on the campaign record.
- UniFi OS Server Pre-Auth RCE Chain (CVE-2026-34908/34909/34910): x-original-uri Auth-Gateway Bypass + package-update Command Injection — CRITICAL · 2026-06-08
- Ubiquiti UniFi OS — Three Max-Severity Pre-Auth Vulnerabilities (CVE-2026-34908 / 34909 / 34910) in Security Advisory Bulletin 064 — CRITICAL · 2026-05-22
Sources
Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on .