baserCMS: Path Traversal in Theme File API Leads to Arbitrary File Write and RCE_CVE-2026-30940

{
    "lastseen": "",
    "description": "baserCMS is a website development framework. Prior to version 5.2.3, a path traversal vulnerability exists in the theme file management API (/baser/api/admin/bc-theme-file/theme_files/add.json) that allows arbitrary file write. An authenticated administrator can include ../ sequences in the path parameter to create a PHP file in an arbitrary directory outside the theme directory, which may result in remote code execution (RCE). This issue has been patched in version 5.2.3.",
    "published": "2026-03-31T00:45:35.177Z",
    "modified": "2026-04-02T14:46:54.107Z",
    "type": "cve",
    "title": "baserCMS: Path Traversal in Theme File API Leads to Arbitrary File Write and RCE",
    "source": "GitHub_M",
    "references": "https://github.com/baserproject/basercms/security/advisories/GHSA-c5c6-37vq-pjcq\nhttps://basercms.net/security/JVN_20837860\nhttps://github.com/baserproject/basercms/releases/tag/5.2.3",
    "id": "CVE-2026-30940",
    "bulletinFamily": "",
    "cwe": [
        "CWE-22",
        "CWE-73"
    ],
    "cvelist": null,
    "sourceData": "baserproject basercms < 5.2.3",
    "sourceHref": "",
    "cvss": {
        "score": 7.2,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "basercms",
    "version": "< 5.2.3",
    "vendor": "baserproject",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}