SmarterTools has released an urgent security update for its SmarterMail email server after fixing a serious vulnerability rated 9.3 on the CVSS scale. The flaw was classified as critical because it could allow attackers to take full control of affected servers. Security experts warned that the issue posed a major risk to exposed systems.
The vulnerability allowed unauthenticated remote code execution, meaning attackers did not need valid login credentials to exploit it. By targeting a specific server function, a remote attacker could execute commands directly on the server. This made the flaw especially dangerous for internet-facing SmarterMail installations.
According to security findings, the flaw affected SmarterMail versions released before Build 9511. Any server running an older build was vulnerable until patched. Because SmarterMail is commonly used by businesses for email communication, the potential impact was considered severe.
The issue was officially tracked as CVE-2026-24423. Attackers could abuse a server API to force SmarterMail to connect to a malicious system. Once connected, the attacker could run arbitrary commands and potentially gain full administrative control.
SmarterTools addressed the vulnerability by releasing Build 9511 on January 15, 2026. This update fully fixes the remote code execution issue and blocks the attack path used in exploitation. The same update also resolved an additional authentication-related security weakness.
The vulnerability was responsibly disclosed by independent security researchers. After receiving the report, SmarterTools investigated the issue and worked to release a fix before widespread exploitation occurred. Researchers noted that vulnerabilities of this nature are often targeted quickly once disclosed.
Security analysts warned that unpatched SmarterMail servers could be used to steal sensitive data, deploy malware, or launch further attacks. Email servers often contain confidential business communications, making them valuable targets for cybercriminals.
System administrators are strongly advised to upgrade to SmarterMail Build 9511 or later immediately. Experts also recommend reviewing logs for suspicious activity and maintaining regular patching practices. The incident highlights the ongoing importance of securing internet-exposed infrastructure.
Stay alert, and keep your security measures updated!
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