Facebook announced on Friday that it had been the target of a series of attacks from an unidentified hacker group, which resulted in the installation of malicious software onto Facebook employee laptops. “Last month, Facebook security discovered that our systems had been targeted in a sophisticated attack,” the company said in a blog post. “The attack occurred when a handful of employees visited a mobile developer website that was compromised.” Facebook said that these employees then had malware installed on their laptops as a result of their visiting the website. The hack used what is called a “zero-day Java exploit,” a known vulnerability in Oracle’s software which has gained much attention in recent months. Essentially, anyone visiting a website using this attack who also has Oracle’s Java enabled in their browser was vulnerable.

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