CVE-2025-55739: FreePBX API

Medium severity, CVSS 5.1. EPSS: 0.4% chance of exploitation in the next 30 days.

api is a module for FreePBX@, which is an open source GUI that controls and manages Asterisk© (PBX). In versions lower than 15.0.13, 16.0.2 through 16.0.14, 17.0.1 and 17.0.2, there is an identical OAuth private key used across multiple systems that installed the same FreePBX RPM or DEB package. An attacker with access to the shared OAuth private key could forge JWT tokens, bypass authentication, and potentially gain full access to both REST and GraphQL APIs. Systems with the "api" module enabled, configured and previously activated by an administrator for remote inbound connections may be affected. This issue is fixed in versions 15.0.13, 16.0.15 and 17.0.3.

Affected products

• FreePBX API: before 15.0.13 (fixed in 15.0.13); from 16.0.2, before 16.0.15 (fixed in 16.0.15); from 17.0.1, before 17.0.3 (fixed in 17.0.3)

Published 2025-09-05. Last modified 2026-06-17.