If you don't secure your web forms, one mistaken click could be all it takes for your users to delete their own accounts. Tom Scott explains.

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More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott

Hacking Websites with SQL Injection: http://www.youtube.com/watch?v=_jKylhJtPmI
Cracking Websites with Cross Site Scripting: http://www.youtube.com/watch?v=L5l9lSnNMxg

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels