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I am currently working on a Bulletin Board system for an acquaintance of mine. All was going well until I was asked to script it to allow HTML OR BBCode (for images and links only). Both of which have atleast some vulnerabilities. HTML more than BBCode.
Now, is this tutorial/method safe? If not, what should I be looking for? Don't be too specific. I learn best from doing it myself, but security is not something I am keen on as of yet.
Thoughts/Suggestions are welcomed.