TYPO3 HTML Sanitizer allows Cross-site Scripting

When

2026-06-12 19:06 UTC

Where

Global (internet)

Category

cyber_advisory · composer

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. Credits to IPC Labs for reporting this vulnerability.

Sources

• GitHub Advisory Database ↗ · first seen 2026-06-12 19:06 UTC

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