If, like me, you have the auto-update feature turned off on your mobile device, and you use WhatsApp for text messenging, you may have a version vulnerable to malware.
A bug affecting WhatsApp has been identified for older versions. You can read about the bug here: ZDNet article about WhatsApp spyware
This bug affects both Android and iPhone users, so if you use WhatsApp, update to the latest version now. The latest update includes a security fix for this bug.