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Critical

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

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-49481
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 08:05 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 12 Aug 2026, 23:08 UTC

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.

osv:CVE-2026-49481
Complete source record
{
  "id": "8f5230db487954cc984b677b990ae706e42c36994d0e131a1bd92c01cd6c9a96",
  "url": "https://osv.dev/vulnerability/CVE-2026-49481",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UpSnap vulnerable to Remote Code Execution via IP Field Template Injection in wake_cmd/shutdown_cmd",
    "summary": "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.",
    "evidence": "osv:CVE-2026-49481",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-49481",
      "aliases": [
        "CVE-2026-49481",
        "GHSA-6mc7-6948-w5h4"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://github.com/seriousm4x/upsnap",
              "type": "GIT",
              "events": [
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                  "introduced": "0"
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                {
                  "fixed": "92f9e295d5f761d874a6701245b2e38dc42cb85a"
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              "database_specific": {
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                    "range": [
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                        "introduced": "0"
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                        "fixed": "5.4.0"
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                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
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                  {
                    "range": [
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                        "fixed": "92f9e295d5f761d874a6701245b2e38dc42cb85a"
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                    "source": "REFERENCES_TAG",
                    "original_tag": "5.4.0"
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                  {
                    "range": [
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                        "introduced": "0"
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                    "source": "DESCRIPTION"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49481.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.610575573Z",
      "provider": "osv",
      "references": [
        "https://github.com/seriousm4x/UpSnap/releases/tag/5.4.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49481.json",
        "https://github.com/seriousm4x/UpSnap/security/advisories/GHSA-6mc7-6948-w5h4",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-49481"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-78"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49481.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-49481",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 501048,
  "published_at": "2026-08-12T23:08:45.158+00:00"
}