Skype warned on Friday that its Android program could be susceptible to attack if its users also have installed a malicious application. Due to a “privacy vulnerability,” criminals can leverage a rogue application to access and steal locally stored Skype for Android files, such as profile data and instant messages, Skype Chief Security Officer Adrian Asher said in a blog post. He said the company is working on “securing file permissions” so the attack can’t happen and advised users to scrutinize any third-party applications they install. The issue was revealed by Android developer Justin Case.