TYPO3 HTML Sanitizer allows Cross-Site Scripting_CVE-2026-47344

2.1 / 10

LOW

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Description

When ALLOW_INSECURE_RAW_TEXT is enabled, whitespace-variant closing tags (e.g., </style\t>) are not recognized by the sanitizer but accepted by browsers as valid end tags, allowing subsequent content to escape sanitization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2.

Basic Information

ID CVE-2026-47344

Source TYPO3

Published Jun 8, 2026 at 19:03

Affected Product

Vendor TYPO3

Product HTML Sanitizer

Affected Versions TYPO3 HTML Sanitizer 0

CWE Classification

CWE-79 CWE-436

References

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    "lastseen": "",
    "description": "When ALLOW_INSECURE_RAW_TEXT is enabled, whitespace-variant closing tags (e.g., </style\\t>) are not recognized by the sanitizer but accepted by browsers as valid end tags, allowing subsequent content to escape sanitization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2.",
    "published": "2026-06-08T19:03:19.826Z",
    "modified": "2026-06-08T19:03:19.826Z",
    "type": "cve",
    "title": "TYPO3 HTML Sanitizer allows Cross-Site Scripting",
    "source": "TYPO3",
    "references": "https://typo3.org/security/advisory/typo3-core-sa-2026-006\nhttps://github.com/TYPO3/html-sanitizer/commit/bd1a88d9b5a5f67f1120ec41084e9c1a0675641c",
    "id": "CVE-2026-47344",
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    "cwe": [
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    "cvelist": null,
    "sourceData": "TYPO3 HTML Sanitizer 0",
    "sourceHref": "",
    "cvss": {
        "score": 2.1,
        "severity": "LOW",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
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        "vectorString": "",
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        "privilegesRequired": "",
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        "cvssV3": {
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    "href": "",
    "category_name": "CVE",
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    "product": "HTML Sanitizer",
    "version": "0",
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