CVE-2026-49481

CRITICAL 9.6

UpSnap vulnerable to Remote Code Execution via IP Field Template Injection in wake_cmd/shutdown_cmd

CVSS Score

9.6

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-78
Vendor	seriousm4x
Product	upsnap
Published	Aug 12, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

seriousm4x / UpSnap

< 5.4.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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