Cross-Site Scripting Protection bypass in HTML Sanitizer

HTML sanitizer is written in PHP, aiming to provide XSS-safe markup based on explicitly allowed tags, attributes and values. In versions prior to 1.5.0 or 2.1.1, malicious markup used in a sequence with special HTML CDATA sections cannot be filtered and sanitized due to a parsing issue in the upstream package masterminds/html5. This allows bypassing the cross-site scripting mechanism of typo3/html-sanitizer. The upstream package masterminds/html5 provides HTML raw text elements (`script`, `style`, `noframes`, `noembed` and `iframe`) as DOMText nodes, which were not processed and sanitized further. None of the mentioned elements were defined in the default builder configuration, that's why only custom behaviors, using one of those tag names, were vulnerable to cross-site scripting. This issue has been fixed in versions 1.5.0 and 2.1.1.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

TYPO3 跨站脚本漏洞

TYPO3是瑞士TYPO3协会的一套免费开源的内容管理系统(框架)(CMS/CMF)。 TYPO3 HTML sanitizer 1.0.0到1.0.7、 2.0.0到2.1.0版本存在跨站脚本漏洞，该漏洞源于上游包 masterminds/html5 中的解析问题，无法过滤和清除在具有特殊 HTML CDATA 部分的序列中使用的恶意标记，这允许绕过 typo3/html-sanitizer 的跨站脚本机制。

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