Attackers have adapted a technique popularized in AI prompt injection research for a high-volume phishing campaign, using invisible Unicode characters to evade email filtering, Microsoft researchers reported Thursday. The finding came from Microsoft Defender for Office 365 prompt injection protection research. A hunting signature built to detect ASCII smuggling in email recorded a surge beginning..
First seen on securityboulevard.com
Jump to article: securityboulevard.com/2026/09/microsoft-finds-ascii-smuggling-repurposed-for-phishing-campaign/
![]()

