CVE-2026-49481

UpSnap is a wake on lan web app. Versions prior to 5.4.0 have an OS command injection vulnerability in the UpSnap’s device management functionality due to the presence of unsafe shell command template interpolation using the ip and the mac fields. User-controlled values can be inserted into the wake_cmd and shutdown_cmd templates and executed via /bin/sh -c (Linux) or cmd /C (Windows) without sanitization, resulting in an authenticated Remote Code Execution (RCE). A low-privileged user with permission to create or edit devices can execute arbitrary operating system commands on the UpSnap hosted server. Version 5.4.0 patches the issue.

CVSS v3 9.6 CRITICAL

9.6^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.1 / Impact : 5.8

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/seriousm4x/UpSnap/releases/tag/5.4.0
https://github.com/seriousm4x/UpSnap/security/advisories/GHSA-6mc7-6948-w5h4

Configurations

No configuration.

History

23 Oct 2026, 19:10

Type	Values Removed	Values Added
Summary		(es) UpSnap es una aplicación web de wake on lan. Las versiones anteriores a la 5.4.0 tienen una vulnerabilidad de inyección de comandos del sistema operativo en la funcionalidad de gestión de dispositivos de UpSnap debido a la presencia de interpolación insegura de plantillas de comandos de shell utilizando los campos ip y mac. Valores controlados por el usuario pueden insertarse en las plantillas wake_cmd y shutdown_cmd y ejecutarse a través de /bin/sh -c (Linux) o cmd /C (Windows) sin sanitización, lo que resulta en una Ejecución Remota de Código (RCE) autenticada. Un usuario con privilegios bajos con permiso para crear o editar dispositivos puede ejecutar comandos arbitrarios del sistema operativo en el servidor que aloja UpSnap. La versión 5.4.0 corrige el problema.

Information

Published : 2026-08-12 23:17

Updated : 2026-10-24 16:10

NVD link : CVE-2026-49481

Mitre link : CVE-2026-49481

CVE.ORG link : CVE-2026-49481

JSON object : View

Products Affected

No product.

CWE

CWE-78

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

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