This is not good. On Thursday, anti-spam company MailChannels warned on its blog that the UK carrier O2 was leaking the images of its customers’ multimedia text messages on the web, thanks to its shockingly lax system for dealing with MMS sent to phones without the ability to open them. O2 would host those images on its own web site and alert the recipient they’d received an MMS. But as MailChannels discovered, a simple Google (NSDQ: GOOG) search was able to pull up online a number of private images and photos that customers had sent to friends.

Though O2 has since fixed the security flaw, Slashdot did a little bit more digging on the MMS hosting that other operators do and found that carriers like Sprint (NYSE: S) and MVNO Boost Mobile will not only show you the picture or video, but will also show you the phone number, download it, print it, forward it or reply to it all form the same web page. Who knows how many other operators are guilty of this?