CVE-2026-23760

Name of the Vulnerable Software and Affected Versions: SmarterTools SmarterMail versions prior to build 9511

Description: SmarterTools SmarterMail contains an authentication bypass vulnerability in the password reset API. The force-reset-password endpoint at /api/v1/admin/force-reset-password permits anonymous requests and does not verify the existing password or a reset token when resetting system administrator accounts. An unauthenticated attacker can supply a target administrator username and a new password to reset the account, resulting in full administrative compromise of the SmarterMail instance. SmarterMail system administrator privileges grant the ability to execute operating system commands. This vulnerability has been actively exploited in the wild, with reports of Warlock ransomware operators gaining access and moving laterally through networks. Approximately 6,000 instances were identified as potentially vulnerable. Exploitation involves resetting admin passwords and leveraging built-in features for remote code execution.

Recommendations: Upgrade to build 9511 or later immediately. Restrict API access via IP allowlisting. Deploy a Web Application Firewall (WAF) for the /force-reset-password endpoint. Implement geo-blocking for admin interfaces. Review access logs for external POST requests, unauthorized admin changes, and new account creations. Rotate exposed credentials.