TYPO3 HTML Sanitizer vulnerable to Cross-Site Scripting
Problem
Due to a parsing issue in the upstream package masterminds/html5, malicious markup used in a sequence with special HTML CDATA sections cannot be filtered and sanitized. This allows bypassing the cross-site scripting mechanism of typo3/html-sanitizer.
Besides that, the upstream package masterminds/html5 provides HTML raw text elements (script, style, noframes, noembed and iframe) as DOMText nodes, which were not processed and sanitized further. None of the mentioned elements were defined in the default builder configuration, that's why only custom behaviors, using one of those tag names, were vulnerable to cross-site scripting.
Solution
Update to typo3/html-sanitizer versions 1.5.0 or 2.1.1 that fix the problem described.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | typo3/cms | >= 10.0.0, < 10.4.33, >= 11.0.0, < 11.5.20, >= 12.0.0, < 12.1.1 | 10.4.33, 11.5.20, 12.1.1 |
| Composer package | typo3/html-sanitizer | >= 1.0.0, < 1.5.0, >= 2.0.0, < 2.1.1 | 1.5.0, 2.1.1 |
References
- https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-hvwx-qh2h-xcfj
- https://nvd.nist.gov/vuln/detail/CVE-2022-23499
- https://github.com/TYPO3/html-sanitizer/pull/105
- https://github.com/TYPO3/html-sanitizer/pull/106
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2022-23499.yaml
- https://github.com/TYPO3/html-sanitizer
- https://github.com/TYPO3/html-sanitizer/releases/tag/v1.5.0
- https://github.com/TYPO3/html-sanitizer/releases/tag/v2.1.1
- https://typo3.org/security/advisory/typo3-core-sa-2022-017
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Composer
- Package
typo3/cms, typo3/html-sanitizer- Disclosed
- 13.12.2022
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-hvwx-qh2h-xcfj - CC BY 4.0
Vulnerability history: typo3/html-sanitizer
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 09.2022 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 5
- Low 1
Disclosures per year
- 2022: 2
- 2023: 2
- 2024: 0
- 2025: 0
- 2026: 2
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TYPO3 HTML Sanitizer vulnerable to Cross-Site Scripting this entry
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