CVE-2026-49481: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in seriousm4x UpSnap
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.
AI Analysis
Technical Summary
UpSnap, a wake on LAN web application by seriousm4x, has an OS command injection vulnerability (CWE-78) in versions before 5.4.0. The vulnerability is due to unsafe interpolation of user-controlled ip and mac fields into shell command templates (wake_cmd and shutdown_cmd) executed via /bin/sh -c on Linux or cmd /C on Windows. This allows an authenticated user with low privileges who can create or edit devices to execute arbitrary OS commands remotely on the hosting server. The issue is patched in version 5.4.0.
Potential Impact
An authenticated low-privileged user with permission to create or edit devices can achieve remote code execution on the server hosting UpSnap. This can lead to full compromise of the server environment, affecting confidentiality and integrity of the system. Availability impact is not indicated. The CVSS v3.1 score is 9.6 (critical), reflecting high impact on confidentiality and integrity with network attack vector and low attack complexity.
Mitigation Recommendations
Upgrade UpSnap to version 5.4.0 or later, which patches this OS command injection vulnerability. No other mitigation details are provided. Patch status is not explicitly stated but the description confirms version 5.4.0 fixes the issue.
CVE-2026-49481: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in seriousm4x UpSnap
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.
CVSS v3.1
Score 9.6critical
Affected software
seriousm4x
UpSnap
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
UpSnap, a wake on LAN web application by seriousm4x, has an OS command injection vulnerability (CWE-78) in versions before 5.4.0. The vulnerability is due to unsafe interpolation of user-controlled ip and mac fields into shell command templates (wake_cmd and shutdown_cmd) executed via /bin/sh -c on Linux or cmd /C on Windows. This allows an authenticated user with low privileges who can create or edit devices to execute arbitrary OS commands remotely on the hosting server. The issue is patched in version 5.4.0.
Potential Impact
An authenticated low-privileged user with permission to create or edit devices can achieve remote code execution on the server hosting UpSnap. This can lead to full compromise of the server environment, affecting confidentiality and integrity of the system. Availability impact is not indicated. The CVSS v3.1 score is 9.6 (critical), reflecting high impact on confidentiality and integrity with network attack vector and low attack complexity.
Mitigation Recommendations
Upgrade UpSnap to version 5.4.0 or later, which patches this OS command injection vulnerability. No other mitigation details are provided. Patch status is not explicitly stated but the description confirms version 5.4.0 fixes the issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-30T04:17:43.095Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a7cfdb8bf8831d5394c43b2
Added to database: 08/12/2026, 23:11:52 UTC
Last enriched: 08/12/2026, 23:26:06 UTC
Last updated: 09/26/2026, 13:47:46 UTC
Views: 148
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