{
"id": "GHSA-p5j5-4j3q-8mq8",
"aliases": [
"CVE-2026-47345"
],
"details": "Namespace attributes are not encoded correctly during HTML serialization. This allows bypassing the cross-site scripting prevention mechanism of `typo3/html-sanitizer` before version 2.3.2.\n\nCredits to Doyensec in collaboration with Claude and Anthropic Research for reporting this vulnerability.",
"summary": "TYPO3 HTML Sanitizer allows Cross-site Scripting",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.3.2"
}
]
}
],
"package": {
"name": "typo3/html-sanitizer",
"ecosystem": "Packagist"
}
}
],
"modified": "2026-06-12T20:07:46Z",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
}
],
"published": "2026-06-12T20:07:46Z",
"references": [
{
"url": "https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-p5j5-4j3q-8mq8",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47345",
"type": "ADVISORY"
},
{
"url": "https://github.com/TYPO3/html-sanitizer/commit/8b5d0be44ded457ca993ec9ca93d859941c63764",
"type": "WEB"
},
{
"url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/html-sanitizer/CVE-2026-47345.yaml",
"type": "WEB"
},
{
"url": "https://github.com/TYPO3/html-sanitizer",
"type": "PACKAGE"
},
{
"url": "https://typo3.org/security/advisory/typo3-core-sa-2026-006",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-79"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": "2026-06-08T20:17:01Z",
"github_reviewed_at": "2026-06-12T20:07:46Z"
}
}