CVE-2026-47345 PUBLISHED

TYPO3 HTML Sanitizer allows Cross-Site Scripting

Assigner: TYPO3
Reserved: 19.05.2026 Published: 08.06.2026 Updated: 08.06.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 5.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	Low
Attack Complexity	Low	Integrity	None	Integrity	Low
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	TYPO3
Product	HTML Sanitizer
Versions	Default: unaffected affected from 0 to 2.3.2 (excl.)

Credits

Doyensec in collaboration with Claude and Anthropic Research reporter
Benjamin Franzke remediation developer

References

Problem Types

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