# CVE-2026-34910: Ubiquiti UniFi OS command injection via improper input validation

Source: https://junglewise.ai/threats/cve-2026-34910-ubiquiti-unifi-os-command-injection-via-improper-input-validation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-22. Updated: 2026-06-23  
License: CC BY 4.0 with a link back

CVE-2026-34910 · Severity: critical · CVSS 10 · Exploited in the wild · Published 2026-05-22

Ubiquiti UniFi OS, the operating system used to manage UniFi networking and security devices, contains a critical vulnerability. A malicious actor on the network can exploit this flaw to take full control of the device without needing a password. This could lead to a complete compromise of the network infrastructure, data theft, or service disruption.

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

## Quick answers

**Is CVE-2026-34910 exploited in the wild?** Yes. CVE-2026-34910 is known to be exploited in the wild, first recorded on 23 June 2026. Treat it as urgent.

**How severe is CVE-2026-34910?** Critical severity, with a CVSS score of 10, published 22 May 2026.

**Which products and versions are affected?** Ubiquiti Inc UniFi OS Server < 5.0.8; Ubiquiti Inc UDM < 5.1.12; Ubiquiti Inc UDM-Pro < 5.1.12; Ubiquiti Inc UDM-SE < 5.1.12; and 8 more.

**Is there a fix for CVE-2026-34910?** 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-2026-34910 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-34910?** 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 multiple Ubiquiti UniFi OS devices, including the Dream Machine (UDM) and UniFi Next-Generation Gateway (EFG) lines. The flaw allows for remote command injection via the network without authentication. An attacker can exploit this to execute arbitrary system commands with elevated privileges, potentially leading to a full system compromise. The vulnerability is addressed in UniFi OS Server version 5.0.8 and various device-specific firmware versions (e.g., 5.1.12 for most UDM models).

## Affected products

- Ubiquiti Inc UniFi OS Server < 5.0.8
- Ubiquiti Inc UDM < 5.1.12
- Ubiquiti Inc UDM-Pro < 5.1.12
- Ubiquiti Inc UDM-SE < 5.1.12
- Ubiquiti Inc UDM-Pro-Max < 5.1.12
- Ubiquiti Inc UDM-Beast < 5.1.11
- Ubiquiti Inc EFG < 5.1.12
- Ubiquiti Inc UDW < 5.1.12
- Ubiquiti Inc UDR < 5.1.12
- Ubiquiti Inc UDR7 < 5.1.12
- Ubiquiti Inc UDR-5G < 5.1.12
- Ubiquiti Inc Express 7 < 5.1.12

## Timeline

- 2026-05-21: disclosed: Initial report via HackerOne
- 2026-05-21: advisory: NVD Published Date
- 2026-06-23: advisory: Advisory publication date

## 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)