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Description

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.

PUBLISHED Reserved 2026-05-19 | Published 2026-06-08 | Updated 2026-06-08 | Assigner TYPO3




LOW: 2.1CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Problem types

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

CWE-436 Interpretation Conflict

Product status

Default status
unaffected

Any version before 2.3.2
affected

Credits

IPC Labs reporter

Oliver Hader remediation developer

References

typo3.org/security/advisory/typo3-core-sa-2026-006 vendor-advisory

github.com/...ommit/bd1a88d9b5a5f67f1120ec41084e9c1a0675641c patch

cve.org (CVE-2026-47344)

nvd.nist.gov (CVE-2026-47344)

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