AIThe Hacker Newsabout 5 hours ago
New CSS Attacks Break Webmail Defenses
1 min read
New research shows email content can escape message boundaries and attack webmail interfaces across Outlook, Gmail, Fastmail, Proton Mail, Yahoo Mail, and AOL Mail. PortSwigger researcher Gareth Heyes presented the work at Black Hat USA 2026. Chains can capture passwords, leak tokens, and hijack AI tools.
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