Hackers Exploiting CSS to Evade Spam Filters & Track User Actions

Researchers have identified a concerning trend where threat actors are increasingly abusing Cascading Style Sheets (CSS) to bypass spam detection systems and covertly track user behaviours.  Observed from the second half of 2024 through February 2025, these sophisticated techniques leverage innocent-looking style properties to conceal malicious content and gather sensitive information about email recipients without […]

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