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

📈 Score: 117👾 Exploit Exists🟡 Public PoC🟣 EPSS 86%🦅 CISA Reported📰 News Worthy

What is CVE-2026-34910?

CVE-2026-34910 is a command injection vulnerability found within UniFi OS devices developed by Ubiquiti Inc. UniFi OS is utilized in various network management solutions, allowing users to configure and monitor network devices seamlessly. This vulnerability arises from improper input validation, enabling an attacker with network access to manipulate command execution on the affected devices. Such exploitation can pose significant risks to organizations, including unauthorized control of network operations, potential data interception, and further compromises to network integrity and security.

Potential impact of CVE-2026-34910

  1. Unauthorized Command Execution: Attackers can execute arbitrary commands on the affected devices, leading to unauthorized actions and potential control over critical network services.

  2. Network Compromise: Successful exploitation can lead to a broader compromise of the network, allowing attackers to move laterally to other connected devices, escalating the threat level across the organization.

  3. Data Breaches: With elevated access, malicious actors are capable of extracting sensitive data, which can result in significant data breaches, regulatory implications, and reputational damage to the organization.

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

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-34910-PoC
Created by Boreas37

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.

References

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

EPSS Score

86% 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

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • 🦅

    CISA Reported

  • 📰

    First article discovered by BleepingComputer

  • Vulnerability published

  • Vulnerability Reserved

.