Threat Actors Exploit Misconfigurations to Spoof Internal Emails
Attackers are increasingly abusing network misconfigurations to send spoofed phishing emails, according to researchers at Microsoft. This technique isn’t new, but Microsoft has observed a surge in these attacks since May 2025. “Phishing actors are exploiting complex routing scenarios and misconfigured spoof protections to effectively spoof organizations’ domains and deliver phishing emails that appear, superficially, to have been sent internally,” the researchers write.