MailChimp Under Siege: Cybercriminals Exploit Email Marketing for Attacks

Cybercriminals are ramping up attacks on MailChimp, one of the most widely used email marketing platforms, exploiting vulnerabilities through phishing, social engineering, and stolen session cookies. Once inside, attackers gain access to subscriber lists, impersonate trusted brands, and spread malicious campaigns—turning a once-reliable tool into a dangerous weapon. Constella’s latest research shows over 1,200 new infections in recent days, with corporate environments increasingly at risk.

The impact is global, with businesses in Mexico, Australia, Colombia, and beyond suffering breaches. Sectors like education, tech, retail, and healthcare are prime targets due to their valuable data and often weak security measures. Even multi-factor authentication (MFA) isn’t enough—hackers are bypassing it using stolen authentication cookies, allowing them to access accounts undetected. As the threat escalates, organizations relying on MailChimp must act fast to secure their systems before cybercriminals strike again.
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