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Threat Intelligence Report

Ghost-Sender - Universal Email Spoofing against Exchange Online

📅 June 9, 2026 📰 labs.infoguard.ch 🔍 0 CVE(s) referenced

A widespread Exchange Online misconfiguration enables attackers to bypass email authentication controls and deliver spoofed emails from any sender directly to user inboxes, posing significant phishing and fraud risks unless specific mitigations are applied.

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