CVE-2026-33000: A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vu

Q: How do I fix CVE-2026-33000?

unifi os server: upgrade to 5.0.8. Exact commands for each OS are on this page.

Q: Is CVE-2026-33000 being exploited?

CVE-2026-33000 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33000 affect?

CVE-2026-33000 affects unifi os server. Severity is critical (CVSS 9.1). 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.

Q: How urgent is CVE-2026-33000?

Priority 49/100. Critical severity

This month

CRITICAL 9.1UPGRADE

CVE-2026-33000 is a critical-severity flaw (CVSS 9.1) affecting unifi os server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-05-22
Last modified	2026-07-23

Publisher (CNA): HackerOne · Vendor: ui

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-22 02:16 UTCPublished CVE record published
2026-07-23 16:10 UTCUpdated Record last modified

ui unifi os server UPGRADE

Affected: < 5.0.8

Fixed in: 5.0.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy unifi-os-server || rpm -q unifi-os-server || unifi-os-server --version

2. UPGRADE to 5.0.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade unifi-os-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade unifi-os-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33000?

unifi os server: upgrade to 5.0.8. Exact commands for each OS are on this page.

Is CVE-2026-33000 being exploited?

CVE-2026-33000 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33000 affect?

CVE-2026-33000 affects unifi os server. Severity is critical (CVSS 9.1). 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.

How urgent is CVE-2026-33000?

Priority 49/100. Critical severity

Software pages

Ubiquiti vulnerabilities

Related CVEs

CVE-2026-34908 CRITICAL 10.0 EXPLOITED UPGRADE UPGRADE Ubiquiti UniFi OS Improper Access Control Vulnerability
CVE-2026-34909 CRITICAL 10.0 EXPLOITED UPGRADE UPGRADE Ubiquiti UniFi OS Path Traversal Vulnerability
CVE-2026-34910 CRITICAL 10.0 EXPLOITED UPGRADE UPGRADE Ubiquiti UniFi OS Improper Input Validation Vulnerability
CVE-2026-34911 HIGH 7.7 UPGRADE UPGRADE A malicious actor with access to the network and low privileges could exploit a Path Traversal vulnerability f
CVE-2026-54401 HIGH 7.7 UPGRADE UPGRADE A malicious actor with access to the network and low privileges could exploit a Server-Side Request Forgery (S

References

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