# CVE-2026-34908: Ubiquiti UniFi OS improper access control

Source: https://junglewise.ai/threats/cve-2026-34908-ubiquiti-unifi-os-improper-access-control  
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-2026-34908 · Severity: critical · CVSS 10 · Exploited in the wild · Published 2026-05-22

Ubiquiti UniFi OS, the software managing UniFi networking and security devices, contains a critical security flaw. An attacker on the network can bypass security controls to make unauthorized changes to the system. This could lead to a complete takeover of the networking hardware, potentially allowing attackers to intercept traffic or disable security infrastructure.

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

## Quick answers

**Is CVE-2026-34908 exploited in the wild?** Yes. CVE-2026-34908 is known to be exploited in the wild, first recorded on 23 June 2026. Treat it as urgent.

**How severe is CVE-2026-34908?** 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-2026-34908?** 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-2026-34908 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-34908?** 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 access control vulnerability (CWE-284) exists in multiple Ubiquiti UniFi OS-based devices, including the Dream Machine (UDM) and UniFi Next-Generation Gateway (EFG) lines. The flaw allows an unauthenticated attacker with network access to bypass authorization mechanisms and modify system configurations. According to the CVSS 3.1 vector, the vulnerability has a high impact on confidentiality, integrity, and availability, and can result in a scope change, potentially affecting the broader network managed by the device. Patches have been released for various product lines, with fixed versions ranging from 5.0.8 to 5.1.12 depending on the specific hardware model.

## 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 disclosure via HackerOne
- 2026-06-23: advisory: NVD 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)