CVE-2026-77540
Received Received - Intake

Command Injection in UniFi OS Server

Publication date: 2026-08-26

Last updated on: 2026-08-26

Assigner: fe490ce8-0395-4072-90d8-2707e1bdf984

Description
A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS Server to execute a Command Injection on the host device.

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Meta Information

Published
2026-08-26
Last Modified
2026-08-26
Generated
2026-08-26
AI Q&A
2026-08-26
EPSS Evaluated
N/A
NVD
CVE-2026-77540
EUVD
EUVD-2026-66367

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
ubiquiti unifi_os_server *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

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Executive Summary

This vulnerability is an Improper Input Validation flaw in UniFi OS Server. A malicious actor with network access and high privileges could exploit it to perform Command Injection on the host device, potentially allowing them to execute arbitrary commands.

Impact Analysis

If exploited, this vulnerability could allow an attacker to take full control of the affected device, leading to unauthorized access, data theft, or disruption of services. It may also enable lateral movement within the network.

Mitigation Strategies

Immediately update UniFi OS Server to the latest patched version to address the Command Injection vulnerability. Restrict network access to high-privilege users and monitor for unusual command execution activities.

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