If you don't want to know the details, that's fine, but don't stop reading quite yet. It's very important that you update your iPhone today. Follow the link for instructions.
Now, the gory details: recently discovered malware is targeting three previously unknown vulnerabilities in iOS, the iPhone's operating system. The vulnerabilities could not only let hackers take over your phone, they could also track your movements and turn on your microphone.
All of this came to light earlier this month when a human rights activist in the United Arab Emirates got a suspicious text that promised new details of torture in UAE prisons. If he had followed the link in the text, it would have implanted highly dangerous malware on his phone.
Fortunately, he didn't and the vulnerability was identified by cybersecurity experts at Citizen Lab, according to an account in The Verge. It was reported to Apple, which prepared fixes for the vulnerabilities in today's release of iOS 9.3.5.
To get the update, go to Settings/General/SoftwareUpdate. If you have a high-speed connection, it should take less than 10 minutes to download and install the update.
This is the first time that three vulnerabilities have been discovered in iOS at the same time, and it's a bit sobering for those who like to think their iPhones are more secure than Android phones. They probably are, but today's revelation is a reminder that, in today's world, nothing is totally secure.