Bypassing Cross-Site Scripting Protection in TYPO3 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
DOM processing instructions are not handled correctly. This allows bypassing the cross-site scripting mechanism of typo3/html-sanitizer.
Solution
Update to typo3/html-sanitizer versions 1.5.3 or 2.1.4 that fix the problem described.
Credits
Thanks to Yaniv Nizry and Niels Dossche who reported this issue, and to TYPO3 core & security team member Oliver Hader 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, < 1.5.3, >= 2.0.0, < 2.1.4 | 1.5.3, 2.1.4 |
References
- https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-mm79-jhqm-9j54
- https://nvd.nist.gov/vuln/detail/CVE-2023-47125
- https://github.com/TYPO3/html-sanitizer/commit/b8f90717251d968c49dc77f8c1e5912e2fbe0dff
- https://github.com/TYPO3/html-sanitizer
- https://typo3.org/security/advisory/typo3-core-sa-2023-007
- 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
- 14.11.2023
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-mm79-jhqm-9j54 - 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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Bypassing Cross-Site Scripting Protection in TYPO3 HTML Sanitizer this entry
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