by Kastro
Paper/Archive/CVE-2026-49481

CVE-2026-49481

seriousm4x UpSnap — UpSnap vulnerable to Remote Code Execution via IP Field Template Injection in wake_cmd/shutdown_cmd

EPSS 1%CVSS 9.6
critical.is priorityof 100
44
CVSS 9.6 (CNA)9.6 / 10 × 3028.8Not in CISA KEV+300.0EPSS percentile 74.0.740 × 2014.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
UpSnap< 5.4.0–CNA

Scores by source

GitHub_M (CNA)9.6CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/seriousm4x/UpSnap/security/advisories/GHSA-6mc7-6948-w5h4refgithub.com/seriousm4x/UpSnap/releases/tag/5.4.0