Executive Summary

Microsoft Security Blog reports that invisible Unicode characters, once used to hide instructions from AI models, are now being employed to obfuscate words in phishing emails, enabling them to bypass email filters.

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Intelligence Metadata - Source Publisher: Microsoft Security - Published Date: 2026-09-03T16:00:00+00:00 - Category: threat-intel

Original Description: Invisible Unicode characters popularized for hiding instructions from AI models are now being used to obfuscate words before email filters parse them. The post ASCII smuggling crosses over from AI prompt injection to phishing evasion appeared first on Microsoft Security Blog.

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