Securityweek
Ransomware Exploits Critical SmarterMail Vulnerability CVE-2026-24423
First seen 6 Feb 2026, 18:16 UTC
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A critical vulnerability in SmarterTools' SmarterMail, identified as CVE-2026-24423, is being actively exploited in ransomware attacks. The flaw allows unauthenticated remote code execution via malicious HTTP requests, affecting users of the email and collaboration server. CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on February 5, 2026.
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