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

Quick assessment

Affected
FreePBX api
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreePBX api是FreePBX开源的一个插件。 FreePBX api 15.0.13之前版本、16.0.2至16.0.14版本和17.0.1至17.0.2版本存在信任管理问题漏洞，该漏洞源于多个系统使用相同的OAuth私钥，可能导致绕过认证。

AI Predicted 9.1 Difficulty: Trivial EPSS 0.42% · P34
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I. Basic Information for CVE-2025-55739

Vulnerability Information
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Vulnerability Title
api: Shared OAuth Signing Key Between Different Instances
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用硬编码的凭证
Source: CVE Program / CVE List V5
Vulnerability Title
FreePBX api 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreePBX api是FreePBX开源的一个插件。 FreePBX api 15.0.13之前版本、16.0.2至16.0.14版本和17.0.1至17.0.2版本存在信任管理问题漏洞，该漏洞源于多个系统使用相同的OAuth私钥，可能导致绕过认证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreePBX api < 15.0.13 -

II. Public POCs for CVE-2025-55739

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III. Intelligence Information for CVE-2025-55739

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Vendor Advisories for CVE-2025-55739 (1)

IV. Related Vulnerabilities

Same product: api
Same vendor: FreePBX
Same weakness: CWE-798

V. Comments for CVE-2025-55739

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