XSS Bypass to Zero Click Account Takeover in AI Chatbot
This vulnerability involves an XSS attack that leads to a zero-click account takeover in an AI chatbot. The application failed to sanitize user input when rendering messages, allowing the injection of malicious JavaScript. By exploiting this flaw, the attacker crafted a payload that overwrote the account token (JSESSIONID) with a malicious cookie, thereby gaining access to the victim's account without clicking any links or performing any further actions. The chatbot did not enforce any Content Security Policy (CSP), making it vulnerable to such attacks. The researcher received a $5,000 bounty for discovering and reporting this critical vulnerability. To prevent similar attacks, enforce strict CSP policies, validate user input, and ensure proper input sanitization. Key lesson: Never trust user input blindly, especially in critical areas like session tokens. #BugBounty #Cybersecurity #WebSecurity #XSS #AccountTakeover
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