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security concerns around regular expressions; using them as security-critical filters, processing user-supplied regexes, vulnerabilities in regex parsers, etc.

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How do I bypass a regex filter that filters all html to avoid xss?

https://owasp.org/www-community/xss-filter-evasion-cheatsheet has a section on alternative characters to <. Here is a summary: %3C &#60, &#060, &#0060, &#00060, &#000060, &#0000060 (and try with a ; …
Martin Thompson's user avatar