Security
New CSS Attacks Can Break Webmail Defenses to Steal Passwords and Tokens
The Hacker News·August 8, 2026·1 min read
New research shows CSS attacks can break webmail defenses to steal passwords and tokens. Content inside an email can escape its message boundary and interfere with the webmail interface. Attack chains span Outlook, Gmail, Fastmail, Proton Mail, Yahoo Mail, and AOL Mail. Techniques can capture passwords, leak tokens, and hijack UI actions.
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