Vulnerability intelligence
CVE-2026-24423
SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability
SmarterTools SmarterMail versions prior to build 9511 contain an unauthenticated remote code execution vulnerability in the ConnectToHub API method. The attacker could point the SmarterMail to the malicious HTTP server, which serves the malicious OS command. This command will be executed by the vulnerable application.
CVSS Score
9.3
Critical
EPSS — Exploit Probability
88%
Riskier than 100% of all CVEs · checked 2026-09-04
Exploitation
Confirmed in the wild
Used in ransomware campaigns
Remediation
Unconfirmed
Federal deadline 2026-02-26
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Deadline for federal agencies: 2026-02-26.
8 articles across 5 outlets · first covered Jan 30, 2026 · latest Feb 13, 2026
Coverage timeline
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Email Under Siege: Storm-2603 Exploits SmarterMail to Deploy Warlock Ransomwaresecurityonline.info · Feb 13, 2026
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Warlock Ransomware Breaches SmarterTools Through Unpatched SmarterMail Serverthehackernews.com · Feb 10, 2026
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Warlock Gang Breaches SmarterTools Via SmarterMail Bugswww.darkreading.com · Feb 9, 2026
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SmarterTools Hit by Ransomware via Vulnerability in Its Own Productwww.securityweek.com · Feb 9, 2026
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U.S. CISA adds SmarterTools SmarterMail and React Native Community CLI flaws to its Known Exploited Vulnerabilities catalogsecurityaffairs.com · Feb 6, 2026
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Critical SmarterMail Vulnerability Exploited in Ransomware Attackswww.securityweek.com · Feb 6, 2026
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SmarterTools patches critical SmarterMail flaw allowing code executionsecurityaffairs.com · Jan 30, 2026
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SmarterMail Fixes Critical Unauthenticated RCE Flaw with CVSS 9.3 Scorethehackernews.com · Jan 30, 2026