Breaking & Securing OAuth 2.0 in Frontends • Philippe De Ryck • YOW! 2025
This talk by Philippe De Ryck explains why common OAuth 2.0 patterns in Single Page Applications (SPAs) are fundamentally insecure against Cross-Site Scripting (XSS) attacks. He demonstrates how defenses like refresh token rotation can be bypassed and introduces the Backend-for-Frontend (BFF) pattern as the secure, recommended solution.