Vulnerability · Published Aug 12, 2026 · Assigned by GitHub_M

CVE-2026-49481UpSnap vulnerable to Remote Code Execution via IP Field Template Injection in wake_cmd/shutdown_cmd

Critical 9.6

In plain English

A critical-severity OS command injection in UpSnap from seriousm4x. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 74% of all known vulnerabilities).

Severity (CVSS 3.1)9.6Critical

Exploit odds (30 days)1.5%top 25.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
seriousm4x	UpSnap	< 5.4.0

Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

References

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