By-passing Cross-Site Scripting Protection in HTML Sanitizer
CVSS:
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C(4.4)
Problem
Due to an encoding issue in the serialization layer, malicious markup nested in a noscript element was not encoded correctly. noscript is disabled in the default configuration, but might have been enabled in custom scenarios. This allows bypassing the cross-site scripting mechanism of typo3/html-sanitizer.
Solution
Update to typo3/html-sanitizer versions 1.5.1 or 2.1.2 that fix the problem described.
Credits
Thanks to David Klein and Yaniv Nizry who reported this issue, and to TYPO3 security team members Oliver Hader and Benjamin Franzke who fixed the issue.
References
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | typo3/html-sanitizer | >= 1.0.0, < 1.5.1, >= 2.0.0, < 2.1.2 | 1.5.1, 2.1.2 |
References
- https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-59jf-3q9v-rh6g
- https://nvd.nist.gov/vuln/detail/CVE-2023-38500
- https://github.com/TYPO3/html-sanitizer/commit/e3026f589fef0be8c3574ee3f0a0bfbe33d7ebdb
- https://github.com/TYPO3/html-sanitizer
- https://typo3.org/security/advisory/typo3-core-sa-2023-002
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Composer
- Package
typo3/html-sanitizer- Disclosed
- 25.07.2023
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-59jf-3q9v-rh6g - 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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By-passing Cross-Site Scripting Protection in HTML Sanitizer this entry
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