SmarterTools network breached using auth-bypass attack against single unpatched virtual machine

Phishing, E-Mail, Network Security, Computer Hacker, Cloud Computing Cyber Security 3d Illustration.

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• SmarterTools hit by Warlock ransomware exploiting CVE-2026-23760 in SmarterMail
• Breach affected office network and data center, but business apps and account data stayed safe
• Company patched vulnerability, ditched Windows servers, and dropped Active Directory to prevent recurrence