They have been known recently to have been hit with Remote Code Execution, or at least there has been a rise in the attacks. It is one of the worst kinds of attacks that can occur to a computer user. Once the attack is successfully launched, the attacker can do pretty much what they wish with your computer. The outcome of an attempted attack depends fairly much upon the attacker's skill and the user's security posture at the time of the attack.
ALL BRANDS of OS's, Windows, Mac & Linux can be struck with remote code execution, if not properly secured, and even if the user was, a click onto the wrong link can nail you. If you have Firefox, the No Script add on can help a lot, only allow scripting on a temporary basis when necessary. I don't know what to suggest for IE, Opera, Chrome & Safari.
Seems like Safari users have been targeted as of late, there was a recent report on this forum about it. I was trying their latest browser out recently, and was hit with an attack like I've never had before. I do admit, I was on a couple of porn sites, but I was looking for their "Safe Search" to cover my back. It was so bad, that I couldn't even get MSE, Malwarebytes or the Malicious Software Tool that we're downloaded every month to work. I attempted to get to the Windows Live Safety Scanner through IE, it locked IE down.
So I booted into XP Pro, and did a full scan with MSE, it really went to cleaning. After two scans, and one with Malwarebytes, I thought I could boot back into 7 and be OK. I did, and as soon as I did, there was a message about a "security update" that I needed to apply urgently. Like a fool, I did, and the whole deal started all over again. Since I had backups of my other OS's, I decided to nuke the drive with DBAN, the first time I used seven rounds of cleaning, then I followed that with three more DOD (three rounds) of cleaning.
I thought after all of that cleaning, everything would be OK, but all of the nuking made it run very hot, left me with drive problems, and above all, taught me that "Safe Search" was not to be relied upon, then when I found out that Safe Search was done by Google, that really pissed me. Several members on this forum had told me previously that I was paranoid, that Google wasn't out to get me. Well, they didn't do it alone, but had a hand in things.
Needless to say, stay as far away from Safari as you can, and Safe Search in particular. Hopefully, you'll won't get burned, as I did.
Cat