SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API
CVSS v3
9.8
CRITICAL
EPSS Score
82.0%
exploit probability
CISA KEV
Yes
known exploited
Exploitation
active
SSVC status
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.
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.
Yes. CVE-2026-24423 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2/26/2026.
CVE-2026-24423 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string 3.1.
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Ranked by exploit probability (EPSS).