900 Sangoma FreePBX Instances Infected With Web Shells

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To mitigate this threat, organizations should immediately restrict access to the FreePBX endpoint manager interface by implementing network segmentation and firewall rules limiting access to trusted IP addresses. Strong authentication mechanisms, including multi-factor authentication (MFA), should be enforced to reduce the risk of credential compromise. Continuous monitoring for unusual command execution and web shell indicators on FreePBX servers is critical. Administrators should audit user accounts and revoke any suspicious or unused credentials. Although no specific patches are listed, organizations must stay alert for official Sangoma security advisories and apply patches promptly once available. Regular backups of configuration and system data should be maintained to enable recovery. Additionally, deploying web application firewalls (WAFs) with custom rules to detect command injection attempts can provide an additional layer of defense. Incident response plans should include procedures for detecting and eradicating web shells and related malware.