A Unicode block once used to stealthily embed malicious prompts in AI attacks—known as ASCII smuggling—is now being exploited by spammers to evade email filters. This block contains invisible characters that disrupt keyword detection by machine learning–based spam classifiers, allowing spammers to obfuscate trigger words without alerting human readers. Microsoft observed a sharp surge in such obfuscated spam emails in early 2026 and recommends updated filtering techniques to counter this evasion tactic.
Cybersecurity.watch
Tracking Threats, Incidents, and Vulnerabilities
Cybersecurity.watch
Tracking Threats, Incidents, and Vulnerabilities