Of course, an online security company has a vested interest in pointing out security loopholes, but still, this makes for interesting reading.
Revuln has taken a look at how Steam runs and has found a tiny security loophole in the way the Steam browser protocol uses a URL handler to perform basic tasks like installing and executing games.
Seems Apple's Safari can run these commands without the user knowing, meaning attackers could potentially use the browser as a means of sliding in and compromising all kinds of games.
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I know, Safari, but a hole is a hole, and the way Revuln found it and detail it is pretty good reading.
STEAM BROWSER PROTOCOL INSECURITY [Revuln, via PC Gamer]