Google Unveils AI Security Agent 'PageBreak' to Automate Vulnerability Detection

Google has introduced PageBreak, an internal AI agent built on the Gemini model designed to autonomously identify security vulnerabilities in its first-party web applications. Since transitioning to a formal project in January 2026, the tool has successfully detected over 500 XSS vulnerabilities. Unlike standard scanners, PageBreak verifies potential flaws by attempting real-world exploits in isolated environments, significantly reducing false positives. Google plans to integrate the agent with CodeMender, an automated repair tool, to streamline the remediation process.