TYPO3 HTML Sanitizer allows Cross-Site Scripting
CVE-2026-47344

2.1LOW

Key Information:

Vendor

Typo3

Status
Html Sanitizer
Vendor
CVE Published:
8 June 2026

What is CVE-2026-47344?

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.

Affected Version(s)

HTML Sanitizer 0 < 2.3.2

References

https://typo3.org/security/advisory/typo3-core-sa-2026-006
vendor-advisory
https://github.com/TYPO3/html-sanitizer/commit/bd1a88d9b5...
patch

CVSS V4

Score:
2.1
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

IPC Labs
Oliver Hader
.