CVE-2026-47345

TYPO3 HTML Sanitizer allows Cross-Site Scripting

State: Published
Severity: 5.1 Medium
Published: Jun 8, 2026
Updated: Jun 8, 2026
Reserved: May 19, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N	TYPO3

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
HTML SanitizerTYPO3	before 2.3.2Affected

References

https://typo3.org/security/advisory/typo3-core-sa-2026-006vendor-advisory
https://github.com/TYPO3/html-sanitizer/commit/8b5d0be44ded457ca993ec9ca93d859941c63764patch

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