Apostrophe has default XSS via `xmp` raw-text passthrough in `sanitize-html`_CVE-2026-44990

{
    "lastseen": "",
    "description": "ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Under the default configuration, versions of `sanitize-html` prior to 2.17.4 can turn attacker-controlled content inside a disallowed `xmp` element into live HTML or JavaScript. This is a sanitizer bypass in the default `disallowedTagsMode: 'discard'` path and can lead to stored XSS in applications that render sanitized output back to users. Version 2.17.4 patches the issue.",
    "published": "2026-06-12T20:39:47.065Z",
    "modified": "2026-06-12T20:39:47.065Z",
    "type": "cve",
    "title": "Apostrophe has default XSS via `xmp` raw-text passthrough in `sanitize-html`",
    "source": "GitHub_M",
    "references": "https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-rpr9-rxv7-x643",
    "id": "CVE-2026-44990",
    "bulletinFamily": "",
    "cwe": [
        "CWE-79"
    ],
    "cvelist": null,
    "sourceData": "apostrophecms sanitize-html < 2.17.4",
    "sourceHref": "",
    "cvss": {
        "score": 9.3,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
        "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": "sanitize-html",
    "version": "< 2.17.4",
    "vendor": "apostrophecms",
    "ai_description": "Sanitizer bypass vulnerability in sanitize-html, allowing stored XSS attacks via xmp element",
    "ai_severity": "Critical",
    "ai_vendor": "ApostropheCMS",
    "ai_product": "sanitize-html",
    "ai_version": "< 2.17.4",
    "ai_score": 9.3
}