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Webmail CSS Attacks Expose a New Risk for AI-Powered Email Tools

A security researcher has demonstrated a series of webmail client vulnerabilities that leverage Cascading Style Sheets (CSS) to steal credentials, hijack sessions, and manipulate AI tools integrated with user inboxes. The research, conducted by Gareth Heyes of PortSwigger, details attack chains against major webmail services including Outlook, Gmail, Fastmail, Proton Mail, Yahoo Mail, and AOL…