http://www.icyphoenix.com/viewtopic.php?f=4&t=1518&p=16311#p16311
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Mighty Gorgon
Sun 10 Jun, 2007 04:36

Re: Why Some Images Are Not Shown In Posts?
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[quote user="isb1009" post="16061"]Thanks, Luca.
But... What are the security holes of allowing special characters in filenames?

Thank you again,[/quote]
If you allow some strange chars, you may be exposed to SQL and PHP injections/inclusions... that's why I've removed this possibility.