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Form validation: What dangerous characters should I look for?


MrCat

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Hi. I have a site where people can post photos and also captions for the photos.

I'm saving the captions in simple text files for including with the HTML. Of course, I don't want someone to put "<script>" in a caption input form, but what else should I filter out?

Is it enough just to destroy all instances of "<"? I want to give people the freedom to include brackets and hyphens etc if possible.

Any ideas appreciated!

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