# CVE-2026-33000: Ubiquiti UniFi OS command injection via improper input validation

Source: https://junglewise.ai/threats/cve-2026-33000-ubiquiti-unifi-os-command-injection-via-improper-input-validation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-22. Updated: 2026-05-22  
License: CC BY 4.0 with a link back

CVE-2026-33000 · Severity: critical · CVSS 9.1 · Published 2026-05-22

A vulnerability in Ubiquiti UniFi OS devices allows an authorized user with high-level administrative privileges to execute unauthorized commands on the underlying operating system. UniFi OS is the management software for Ubiquiti networking hardware, such as routers and switches. If exploited, an attacker could gain full control over the device, potentially leading to network-wide disruptions or unauthorized access to sensitive traffic.

Technologies: [Ubiquiti UniFi OS](https://junglewise.ai/threats/technologies/unifi-os). Vendors: [Ubiquiti](https://junglewise.ai/threats/vendors/ubiquiti).

## Quick answers

**Is CVE-2026-33000 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-33000 being exploited in the wild.

**How severe is CVE-2026-33000?** Critical severity, with a CVSS score of 9.1, published 22 May 2026.

**Which products and versions are affected?** Ubiquiti UniFi OS.

**Is there a fix for CVE-2026-33000?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-33000 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-33000?** Check whether you run Ubiquiti UniFi OS. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An improper input validation vulnerability (CWE-20) exists in Ubiquiti UniFi OS devices. The flaw allows a remote attacker with high-level administrative privileges to bypass input filters and inject arbitrary commands into the system shell. The vulnerability is reachable via the network and does not require user interaction. Successful exploitation results in a complete compromise of the device's integrity, confidentiality, and availability, with the potential for impact to extend beyond the affected component to the wider network environment (Scope: Changed).

## Affected products

- Ubiquiti UniFi OS

## Timeline

- 2026-05-22: advisory: NVD publication date

## References

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

## Related threats

- [Ubiquiti UniFi OS CRLF injection authentication bypass](https://junglewise.ai/threats/cve-2026-77550-ubiquiti-unifi-os-crlf-injection-authentication-bypass)
- [Ubiquiti UniFi OS CRLF injection authentication bypass](https://junglewise.ai/threats/cve-2026-77549-ubiquiti-unifi-os-crlf-injection-authentication-bypass)
- [Ubiquiti UniFi OS active debug code privilege escalation](https://junglewise.ai/threats/cve-2026-77545-ubiquiti-unifi-os-active-debug-code-privilege-escalation)
- [Ubiquiti UniFi OS command injection vulnerability](https://junglewise.ai/threats/cve-2026-77540-ubiquiti-unifi-os-command-injection-vulnerability)
- [Ubiquiti UniFi OS command injection in input validation](https://junglewise.ai/threats/cve-2026-77539-ubiquiti-unifi-os-command-injection-in-input-validation)