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CVE-2026-44237— FreePBX: Authenticated Access can lead to Subsequent OAuth2 Authentication Bypass in API Module

Quick assessment

Affected
FreePBX security-reporting
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是FreePBX项目的一套通过GUI（基于网页的图形化接口）配置Asterisk（IP电话系统）的工具。 FreePBX 17.0.8之前版本存在安全漏洞，该漏洞源于api模块的OAuth2实现在令牌颁发期间未充分验证客户端凭证，导致任何知道有效client_id的方可在不提供正确client_secret的情况下获取OAuth2访问令牌。

AI Predicted 8.1 Difficulty: Easy EPSS 0.35% · P27

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreePBX security-reporting < 17.0.8 affected
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I. Basic Information for CVE-2026-44237

Vulnerability Information
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Vulnerability Title
FreePBX: Authenticated Access can lead to Subsequent OAuth2 Authentication Bypass in API Module
Source: CVE Program / CVE List V5
Vulnerability Description
FreePBX is an open source IP PBX. Prior to 17.0.8, the FreePBX api module's OAuth2 implementation does not sufficiently validate client credentials during token issuance. Knowledge of a valid client_id is required. The validateClient() method in ClientRepository.php unconditionally returns true, allowing any party with knowledge of a valid client_id to obtain OAuth2 access tokens without providing the correct client_secret. This vulnerability is fixed in 17.0.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1390
Source: CVE Program / CVE List V5
Vulnerability Title
FreePBX 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreePBX是FreePBX项目的一套通过GUI（基于网页的图形化接口）配置Asterisk（IP电话系统）的工具。 FreePBX 17.0.8之前版本存在安全漏洞，该漏洞源于api模块的OAuth2实现在令牌颁发期间未充分验证客户端凭证，导致任何知道有效client_id的方可在不提供正确client_secret的情况下获取OAuth2访问令牌。
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 security-reporting < 17.0.8 -

II. Public POCs for CVE-2026-44237

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III. Intelligence Information for CVE-2026-44237

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Vendor Advisories for CVE-2026-44237 (1)

Same Patch Batch · FreePBX · 2026-05-29 · 4 CVEs total

CVE-2026-46376 9.3 CRITICAL FreePBX: Unauthenticated Use of Hard-Coded Credentials Vulnerability in FreePBX UCP Interf
CVE-2026-44239 FreePBX: Authenticated Local File Inclusion in Dashboard Module
CVE-2026-44238 FreePBX: Authenticated SQL Injection via ORDER BY in CDR Reports

IV. Related Vulnerabilities

Same product: security-reporting
Same vendor: FreePBX
Same weakness: CWE-1390

V. Comments for CVE-2026-44237

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