CVE-2026-47345: TYPO3 Html Sanitizer

Medium severity, CVSS 5.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Namespace attributes are not encoded correctly during HTML serialization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2.

Affected products

• TYPO3 Html Sanitizer: before 2.3.2 (fixed in 2.3.2)

Published 2026-06-08. Last modified 2026-07-23.