CVE-2025-66039: Sangoma FreePBX

Critical severity, CVSS 9.8. EPSS: 3.3% chance of exploitation in the next 30 days.

FreePBX Endpoint Manager is a module for managing telephony endpoints in FreePBX systems. Versions are vulnerable to authentication bypass when the authentication type is set to "webserver." When providing an Authorization header with an arbitrary value, a session is associated with the target user regardless of valid credentials. This issue is fixed in versions 16.0.44 and 17.0.23.

Affected products

• Sangoma FreePBX: before 16.0.44 (fixed in 16.0.44); from 17.0.1, before 17.0.23 (fixed in 17.0.23)

Published 2025-12-09. Last modified 2026-09-25.