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CSS: The Hidden Threat Lurking in Your Inbox
August 5, 2026 · Dark Reading · Severity: MEDIUM
Researchers warn that CSS, once only used for design, is now powerful enough to exfiltrate data from webmail inboxes. Some vendors are not prepared for this hidden threat.
Key Takeaways
- CSS can now exfiltrate data from webmail inboxes.
- Researchers warn that some vendors are not prepared for this threat.
- CSS has evolved from a design tool to a hidden security risk.