CVE-2025-61084

MDaemon Mail Server 23.5.2 validates SPF, DKIM, and DMARC using the email enclosed in angle brackets in the From: header of SMTP DATA. An attacker can craft a From: header with multiple invisible Unicode thin spaces to display a spoofed sender while passing validation, allowing email spoofing eve...

Microsoft 365 Direct Send Abuse

The Rapid7 MDR team has observed a significant rise in the number of threat actors leveraging a lesser-known feature within Microsoft 365 called Direct Send. Rapid7 encourages organizations to immediately review their authenticated mail flow configurations, specifically related to Microsoft 365...