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CSS: The Hidden Threat Lurking in Your Inbox
August 5, 2026 · Dark Reading · Severity: MEDIUM
CSS is no longer just for styling web pages. Researchers warn it can now be used to exfiltrate data from webmail, catching many vendors off guard.
Key Takeaways
- CSS can now be weaponized to exfiltrate data from webmail services. Vendors may lack preparation for this emerging attack vector. Researchers highlight CSS as a potent tool beyond design.
- CSS can now be weaponized to exfiltrate data from webmail services. Vendors may lack preparation for this emerging attack vector. Researchers highlight CSS as a potent tool beyond design.
- CSS can now be weaponized to exfiltrate data from webmail services. Vendors may lack preparation for this emerging attack vector. Researchers highlight CSS as a potent tool beyond design.