What’s Vulnerable › Vulnerabilities

CVE-2023-47125: By-passing Cross-Site Scripting Protection in HTML Sanitizer

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-11-14 · updated 2026-06-17
• Weakness: CWE-79

Description

TYPO3 is an open source PHP based web content management system released under the GNU GPL. In affected versions DOM processing instructions are not handled correctly. This allows bypassing the cross-site scripting mechanism of typo3/html-sanitizer. This vulnerability has been addressed in versions 1.5.3 and 2.1.4. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

• TYPO3 html-sanitizer: from 1.0.0 before 1.5.3; from 2.0.0 before 2.1.4 — fixed in 1.5.3, 2.1.4
• typo3: from 8.7.42 before 8.7.55; from 9.5.29 before 9.5.44; from 10.4.19 before 10.4.41; from 11.3.2 before 11.5.33; from 12.0.0 before 12.4.8 — fixed in 10.4.41, 11.5.33, 12.4.8, 8.7.55, 9.5.44

How to fix

Upgrade to a fixed version: TYPO3 html-sanitizer 1.5.3, 2.1.4; typo3 10.4.41, 11.5.33, 12.4.8, 8.7.55. Check the vendor advisory for mitigations.

References

• https://github.com/TYPO3/html-sanitizer/commit/b8f90717251d968c49dc77f8c1e5912e2fbe0dff
• https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-mm79-jhqm-9j54
• https://typo3.org/security/advisory/typo3-core-sa-2023-007
• https://github.com/TYPO3/html-sanitizer/commit/b8f90717251d968c49dc77f8c1e5912e2fbe0dff
• https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-mm79-jhqm-9j54
• https://typo3.org/security/advisory/typo3-core-sa-2023-007

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