March 17, 2025 By Pierluigi Paganini
Threat actors exploit Cascading Style Sheets (CSS) to bypass spam filters and detection engines, and track users’ actions and preferences.
Cisco Talos observed threat actors abusing Cascading Style Sheets (CSS) to evade detection and track user behavior, raising security and privacy concerns, including potential fingerprinting.
Cascading Style Sheets (CSS) is a stylesheet language used to control the appearance and layout of web pages. It defines styles for HTML elements, including colors, fonts, spacing, and positioning. CSS helps separate content from design, allowing developers to create visually appealing and responsive websites. It also supports animations and themes and works alongside HTML and JavaScript to enhance web experiences.