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Krause said he created a simple tool that allows anyone to check if an in-app browser is injecting JavaScript code when rendering a website. In a tweet, a spokesperson for Facebook and Instagram parent company Meta said that the company "intentionally developed this code to honor people's App Tracking Transparency (ATT) choices on our platforms." "During this analysis, every app besides TikTok offered a way to do this."įacebook and Instagram are two other apps that insert JavaScript code into external websites loaded in their in-app browsers, giving the apps the ability to track user activity, according to Krause. "Whenever you open a link from any app, see if the app offers a way to open the currently shown website in your default browser," wrote Krause.
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Krause said users who wish to protect themselves from any potential malicious usage of JavaScript code in in-app browsers should switch to viewing a given link in the platform's default browser if possible, such as Safari on the iPhone and iPad. "Like other platforms, we use an in-app browser to provide an optimal user experience, but the Javascript code in question is used only for debugging, troubleshooting and performance monitoring of that experience - like checking how quickly a page loads or whether it crashes," the statement said, according to Forbes. In a statement shared with Forbes, a TikTok spokesperson acknowledged the JavaScript code in question, but said it is only used for debugging, troubleshooting, and performance monitoring to ensure an "optimal user experience." However, the researcher added that "just because an app injects JavaScript into external websites, doesn't mean the app is doing anything malicious." "From a technical perspective, this is the equivalent of installing a keylogger on third party websites," wrote Krause, in regards to the JavaScript code that TikTok injects. Krause said TikTok's in-app browser "subscribes" to all keyboard inputs while a user interacts with an external website, including any sensitive details like passwords and credit card information, along with every tap on the screen. TikTok's custom in-app browser on iOS reportedly injects JavaScript code into external websites that allows TikTok to monitor "all keyboard inputs and taps" while a user is interacting with a given website, according to security researcher Felix Krause, but TikTok has reportedly denied that the code is used for malicious reasons.