Command Injection Vulnerability in UniFi OS Devices by Ubiquiti
CVE-2026-34910

10CRITICAL

Key Information:

Vendor

Ubiquiti Inc

Status
Unifi Os Server
Udm
Udm-pro
Udm-se
Vendor
CVE Published:
22 May 2026

Badges

👾 Exploit Exists🟣 EPSS 33%🦅 CISA Reported📰 News Worthy

What is CVE-2026-34910?

A security flaw in UniFi OS devices allows malicious actors with network access to exploit improper input validation, leading to potential command injection attacks. This vulnerability enables unauthorized commands to be executed on the affected devices, which can compromise the integrity and security of the network. It is crucial for users to apply necessary patches and monitor network activities to mitigate potential risks.

CISA has reported CVE-2026-34910

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2026-34910 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Affected Version(s)

EFG 0 < 5.1.12

ENVR 0 < 5.1.12

ENVR-Core 0 < 5.1.12

News Articles

favicon imageBleepingComputer

Critical UniFi OS bug lets hackers gain root without authentication

Attackers can chain three already fixed vulnerabilities in the Ubiquiti UniFi OS server to execute remote code with root privileges and without authentication.

2 weeks ago

References

https://community.ui.com/releases/Security-Advisory-Bulle...

EPSS Score

33% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
10
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • 🦅

    CISA Reported

  • 📰

    First article discovered by BleepingComputer

  • Vulnerability published

  • Vulnerability Reserved

.