Apostrophe has Server-Side Prototype Pollution in apos.util.set via patch operators that leads to process-wide authorization bypass_CVE-2026-53609

{
    "lastseen": "",
    "description": "ApostropheCMS is an open-source Node.js content management system. In versions up to and including 4.30.0, `apos.util.set()` traverses dot-notation paths without sanitizing `__proto__`, allowing an authenticated editor to write arbitrary values to `Object.prototype` via the `$pullAll` patch operator. A confirmed gadget in `publicApiCheck()` causes this to bypass authorization on all piece-type REST API endpoints for every subsequent unauthenticated request, for the lifetime of the Node.js process. As of time of publication, no known patched versions are available.",
    "published": "2026-06-12T20:59:25.486Z",
    "modified": "2026-06-12T20:59:25.486Z",
    "type": "cve",
    "title": "Apostrophe has Server-Side Prototype Pollution in apos.util.set via patch operators that leads to process-wide authorization bypass",
    "source": "GitHub_M",
    "references": "https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-6h5j-32cf-4253",
    "id": "CVE-2026-53609",
    "bulletinFamily": "",
    "cwe": [
        "CWE-1321"
    ],
    "cvelist": null,
    "sourceData": "apostrophecms apostrophe <= 4.30.0",
    "sourceHref": "",
    "cvss": {
        "score": 9.1,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L",
        "version": "3.1"
    },
    "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": "apostrophe",
    "version": "<= 4.30.0",
    "vendor": "apostrophecms",
    "ai_description": "Server-Side Prototype Pollution vulnerability in ApostropheCMS via apos.util.set, allowing authenticated editors to bypass authorization on REST API endpoints",
    "ai_severity": "Critical",
    "ai_vendor": "ApostropheCMS",
    "ai_product": "ApostropheCMS",
    "ai_version": "<= 4.30.0",
    "ai_score": 9.1
}