Christopher Weibel enhanced the security of the cloudfoundry/uaa repository by hardening OAuth2 and OIDC authentication flows. He increased the nonce and state parameter lengths from 12 and 10 to 22 characters, reducing predictability and mitigating CSRF risks. Using Java, he implemented robust parameter validation and developed an automated test suite to ensure the new security measures functioned as intended. His work focused on security-focused coding and test-driven development, improving the reliability of parameter handling and reducing vulnerability exposure. Over the course of the month, Christopher demonstrated depth in OAuth2, OIDC, and security best practices through targeted, maintainable engineering changes.