If you have an iPhone, iPad, Mac, Apple TV or Apple Watch, it's a good idea to update the device right now. Today.
The flaw being discussed in the news this week allows a hacker in through a simple text message or email sent to your Apple device. Once in your system, the attacker can take over your device.
Depending on your configuration, if your device is set to display images automatically, which is the default setting, no user interaction with the malicious message is required for the hack to be successful. All the user has to do is open the tainted message, thereby rendering the exploit-tinged image contained in the message. This makes the attack difficult to detect.
On your iOS device, use the Settings app to update the operating system.
For more information, see iOS flaw lets hackers access iPhones using an iMessage. The video is quite helpful.