OpenMage LTS has Customer File Upload Extension Blocklist Bypass that Leads to Remote Code Execution_CVE-2026-40488

{
    "lastseen": "",
    "description": "Magento Long Term Support (LTS) is an unofficial, community-driven project provides an alternative to the Magento Community Edition e-commerce platform with a high level of backward compatibility. Prior to version 20.17.0, the product custom option file upload in OpenMage LTS uses an incomplete blocklist (`forbidden_extensions = php,exe`) to prevent dangerous file uploads. This blocklist can be trivially bypassed by using alternative PHP-executable extensions such as `.phtml`, `.phar`, `.php3`, `.php4`, `.php5`, `.php7`, and `.pht`. Files are stored in the publicly accessible `media/custom_options/quote/` directory, which lacks server-side execution restrictions for some configurations, enabling Remote Code Execution if this directory is not explicitly denied script execution. Version 20.17.0 patches the issue.",
    "published": "2026-04-20T16:23:07.429Z",
    "modified": "2026-04-20T16:55:05.724Z",
    "type": "cve",
    "title": "OpenMage LTS has Customer File Upload Extension Blocklist Bypass that Leads to Remote Code Execution",
    "source": "GitHub_M",
    "references": "https://github.com/OpenMage/magento-lts/security/advisories/GHSA-3j5q-7q7h-2hhv",
    "id": "CVE-2026-40488",
    "bulletinFamily": "",
    "cwe": [
        "CWE-434"
    ],
    "cvelist": null,
    "sourceData": "OpenMage magento-lts < 20.17.0",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "magento-lts",
    "version": "< 20.17.0",
    "vendor": "OpenMage",
    "ai_description": "OpenMage LTS has a blocklist bypass vulnerability that allows remote code execution by uploading malicious files with alternative PHP-executable extensions.",
    "ai_severity": "High",
    "ai_vendor": "OpenMage",
    "ai_product": "magento-lts",
    "ai_version": "< 20.17.0",
    "ai_score": 8.7
}