OpenAI details how it prevents attackers from using ChatGPT to secretly steal your data via URL requests. When AI agents fetch web content, they can be tricked into loading links that contain sensitive info like emails or document titles. Attackers use prompt injection—hiding instructions in web pages to command the model—to exfiltrate data through background requests, like loading an image. A simple fix, like allowing only trusted domains, fails because attackers exploit redirects from those domains. OpenAI’s solution? Instead of checking domain reputations, they verify if a URL exists in a public web index, crawled independently of user data. If a link is publicly known, it’s unlikely to hold private info. This approach avoids false alarms that annoy users while stopping covert leaks. Why it matters: As AI agents gain autonomy to browse and act, robust safeguards like this are crucial to prevent a new class of stealthy data breaches that users might never notice.