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Welcome to Software Development on Codidact!

Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.

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Q&A Migrating HTML strings to a more secure alternative

Switching from HTML to Markdown to minimize risk of HTML injection doesn't make a lot of sense to me, since most Markdown implementations support a subset of HTML inline anyway. The better ones con...

posted 3y ago by r~~‭

Answer
#1: Initial revision by user avatar r~~‭ · 2022-02-04T18:55:07Z (almost 3 years ago)
Switching from HTML to Markdown to minimize risk of HTML injection doesn't make a lot of sense to me, since most Markdown implementations support a subset of HTML inline anyway. The better ones control what subset of HTML to allow by using a sanitizing library, such as (to take just one random example) [Bleach](https://github.com/mozilla/bleach). You might as well just use such a library yourself, if all you're concerned about is security. You'll get the same level of safety—i.e., you're fine as long as the underlying library isn't exploitable—and there will be fewer moving parts to audit and much less of the rest of the system needs to change or be migrated.