MediumGHSA-mm79-jhqm-9j54BIT-typo3-2023-47125CVE-2023-47125

Bypassing Cross-Site Scripting Protection in TYPO3 HTML Sanitizer

Published 14 Nov 2023 · Updated 10 Sept 2026

Affected packages

typo3/html-sanitizerComposer

Affected: >=1.0.0 <1.5.3
Fixed in: 1.5.3

Update to the fixed version for your release line, for example:composer require typo3/html-sanitizer:^1.5.3

typo3/html-sanitizerComposer

Affected: >=2.0.0 <2.1.4
Fixed in: 2.1.4

Update to the fixed version for your release line, for example:composer require typo3/html-sanitizer:^2.1.4

Details

> ### 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

Is GHSA-mm79-jhqm-9j54 in any of your client repos?

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References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.