Dive into a comprehensive exploration of modern web technology vulnerabilities with top-ranked white-hat hacker Frans Rosén in this 43-minute conference talk from OWASP AppSec EU 2018. Discover methodologies for accessing private Slack tokens through postMessage and WebSocket-reconnect techniques, and learn how misconfigured AWS and Google Cloud settings can lead to full asset control by attackers. Gain insights into new hacks, bug bounty experiences, and eye-opening revelations about the true security of seemingly safe protocols and policies. Topics covered include AppCache, Dropbox upload policies, postmessage vulnerabilities, document service exploits, clientside race conditions, jQuery security issues, and more. Conclude with a Q&A session to deepen your understanding of cutting-edge web security challenges.