What’s Vulnerable › Vulnerabilities

CVE-2025-55739: api: Shared OAuth Signing Key Between Different Instances

• Severity: medium (CVSS 5.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-05 · updated 2026-06-17
• Weakness: CWE-522

Description

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; from 16.0.2, < 16.0.15; from 17.0.1, < 17.0.3

References

• https://github.com/FreePBX/api/commit/305295aad38322c74cffd75bf550707dfb1a64a2
• https://github.com/FreePBX/security-reporting/security/advisories/GHSA-3r47-p39v-vqqf

Get alerted when CVE-2025-55739 or the next vulnerability affects your stack