Why is WebView less secure? Why is authorization through WebView less secure?

WebView is less secure for several reasons:

• Lack of isolation: WebView runs web content inside the app but does not always provide full isolation from the rest of the app, which can lead to data leaks.
• Implementation vulnerabilities: Built-in browsers may contain outdated or vulnerable components that attackers can exploit.
• Lack of content control: Arbitrary content can be loaded into WebView, increasing the risk of malicious code injection.

Authorization via WebView is less secure because:

• The user enters their credentials into a WebView controlled by the app, not a separate browser, which may allow the app to intercept this data.
• There is no guarantee that the user sees the actual URL and certificate, increasing the risk of phishing.
• Modern recommendations (e.g., OAuth 2.0) suggest using external browsers or specialized components (Custom Tabs, SFSafariViewController) for authorization to ensure security and user trust.