CVE-2026-47344 PUBLISHED

TYPO3 HTML Sanitizer allows Cross-Site Scripting

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

When ALLOW_INSECURE_RAW_TEXT is enabled, whitespace-variant closing tags (e.g., </style\t>) are not recognized by the sanitizer but accepted by browsers as valid end tags, allowing subsequent content to escape sanitization. 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:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CVSS Score: 2.1

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	Present	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

IPC Labs reporter
Oliver Hader remediation developer

References

Problem Types

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE
CWE-436 Interpretation Conflict CWE