FreePBX 2026: INJ3CTOR3's EncystPHP Web Shell Exploitation
In early 2026, over 900 Sangoma FreePBX instances were compromised through the exploitation of a post-authentication command injection vulnerability, CVE-2025-64328. This flaw allowed attackers, notably the INJ3CTOR3 group, to deploy the EncystPHP web shell, enabling remote command execution and persistent access. The majority of affected systems were located in the United States, with significant numbers also in Brazil, Canada, Germany, and France. The exploitation led to unauthorized outbound calls and potential lateral movement within networks. This incident underscores the critical importance of promptly applying security patches and restricting administrative access to trusted networks. The widespread nature of these attacks highlights the ongoing threat to VoIP infrastructures and the necessity for organizations to implement robust security measures to protect against such vulnerabilities.
Kill Chain
