The Sangoma FreePBX Security Team has issued an advisory warning about an actively exploited FreePBX zero-day vulnerability that impacts systems with an administrator control panel (ACP) exposed to the public internet. FreePBX is an open-source private branch exchange (PBX) platform widely used by businesses, call centers, and service providers to manage voice communications. It's built on top of Asterisk, an open-source communication server. The vulnerability, assigned the CVE identifier CVE-2025-57819, carries a CVSS score of 10.0, indicating maximum severity. "Insufficiently sanitized user-supplied data allows unauthenticated access to FreePBX Administrator, leading to arbitrary database manipulation and remote code execution," the project maintainers said in an advisory. The issue…