TYPO3 HTML Sanitizer allows Cross-site Scripting
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. Credits to IPC Labs for reporting this vulnerability.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-47344US | — | — | ||
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… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/html-sanitizer/CVE-2026-47344.yamlWEB
- https://github.com/TYPO3/html-sanitizerPACKAGE
- https://github.com/TYPO3/html-sanitizer/commit/bd1a88d9b5a5f67f1120ec41084e9c1a0675641cWEB
- https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-jvf5-rxvv-3mcgWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-47344ADVISORY
- https://typo3.org/security/advisory/typo3-core-sa-2026-006WEB
scry
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