SmarterMail Fixes Critical Unauthenticated RCE Flaw with CVSS 9.3 Score
Jan 30, 2026
Vulnerability / Email Security
SmarterTools has addressed two more security flaws in SmarterMail email software, including one critical security flaw that could result in arbitrary code execution. The vulnerability, tracked as CVE-2026-24423 , carries a CVSS score of 9.3 out of 10.0. "SmarterTools SmarterMail versions prior to build 9511 contain an unauthenticated remote code execution vulnerability in the ConnectToHub API method," according to a description of the flaw in CVE.org. "The attacker could point the SmarterMail to the malicious HTTP server, which serves the malicious OS [operating system] command. This command will be executed by the vulnerable application." watchTowr researchers Sina Kheirkhah and Piotr Bazydlo, CODE WHITE GmbH's Markus Wulftange , and VulnCheck's Cale Black have been credited with discovering and reporting the vulnerability. The security hole has been addressed in version Build 9511, released on January 15, 2026. The same build also patches another c...
