According to appleinsider, Safari in iOS 6 contains a severe JavaScript vulnerability, which may cause security and privacy problems. The latest iOS 6 includes the "smart App Banner" feature, which allows developers to recommend apps to users on their websites. Smart App banners can detect whether recommended apps are installed on your system, and provide you with options to enable or view them in the App Store Based on the installation conditions.
For those who Disable JavaScript, as long as they access a website that contains the "smart App Banner" function, JavaScript will be automatically opened and users will not receive any notifications. A few months ago, when iOS 6 was released, Michael Stockwell, founder of FizzPow Games, discovered the problem and all devices running iOS 6, security vulnerabilities that are automatically enabled by JavaScript exist in iPhone, iPad, and iPod Touch. The message said that the problem was not corrected for iOS 6.1 in the test.