Last week we reported WhatsApp had disappeared from view on the Windows Phone Marketplace (it was actually set to private), and were awaiting official clarification on the matter. Turns out, according to a report over at MonWindowsPhone, the app has a serious security flaw, which requires the team to pull the app and look into the problem. An update is well on its way.
The app enables Windows Phone owners to send messages to other devices and is available for multiple platforms. German website ComputerBild reported that an Android app, called WhatsAppSniffer, allowed users to access messages sent using WhatsApp on a WiFi network. The developers of the popular messaging service are patching the app due to it sending messages via XMP protocol and in plain text.
We'll keep you posted and will announce when the app is available on the Marketplace with the patch bundled in an update for existing users. In the meantime, you can checkout some early images of the Windows Phone 8 version of WhatsApp.
Update: We've received word from a WhatsApp employee stating the following in an email,
"This has nothing to do with security. Please don't spread mis-information."
Take it as you will. We'll look forward to more information and possible clarification. Until then, WhatsApp is not available until the promised update is released to the Marketplace.