upload exploit in version 1.1.5

hi everybody,
long time ago i launched a gallery using zenphoto version 1.1.5, since then it ran successfully until now:
i discovered that some malicious *.php files where uploaded to it, thus i'm interested to find out in which way was it done. server logs didn't show anything use full at all, server account wasn't hacked(or it seams so), site contained only zenphoto gallery.

my question would be, if there was some exploit that could allow writing files into web directory, or would it be possible if someone knew zenphoto gallery users account?

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