CVE-2025-66039
FreePBX Endpoint Manager Allows Unauthenticated Logins to Administrator Control Panel via Forged Basic Auth Header
Description
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.
INFO
Published Date :
Dec. 9, 2025, 10:16 p.m.
Last Modified :
Dec. 12, 2025, 3:19 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update FreePBX Endpoint Manager to version 16.0.44 or later.
- Update FreePBX Endpoint Manager to version 17.0.23 or later.
Public PoC/Exploit Available at Github
CVE-2025-66039 has a 4 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-66039.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-66039 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-66039
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
This repository documents three security vulnerabilities discovered in FreePBX (CVE-2025-66039, CVE-2025-61678, CVE-2025-61675), including analysis, impact, and proof-of-concept details for security research and awareness purposes.
Detection for CVE-2025-61675, CVE-2025-61678 & CVE-2025-66039
freepbx
This vulnerability allows both authenticated and unauthenticated remote attackers to execute remote code on vulnerable FreePBX instances. These issues have been fixed in FreePBX versions 16.0.42, 16.0.92, 17.0.6, and 17.0.22. It's important to note that this authentication bypass vulnerability is not present in the default FreePBX configuration.
Python
A collection of Vulnerability Research and Reverse Engineering writeups.
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-66039 vulnerability anywhere in the article.
-
Daily CyberSecurity
Critical FreePBX Flaw (CVE-2025-66039) Risks PBX Takeover via Authentication Bypass in ‘webserver’ Auth Mode
A critical security vulnerability has been discovered in FreePBX, the world’s most popular open-source PBX platform, potentially leaving thousands of phone systems vulnerable to complete takeover. Tra ... Read more
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CybersecurityNews
FreePBX Vulnerabilities Enables Authentication Bypass that Leads Remote Code Execution
FreePBX has addressed critical vulnerabilities enabling authentication bypass and remote code execution in its Endpoint Manager module. Discovered by Horizon3.ai researchers, these flaws affect teleph ... Read more
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The Hacker News
FreePBX Patches Critical SQLi, File-Upload, and AUTHTYPE Bypass Flaws Enabling RCE
Dec 15, 2025Ravie LakshmananVulnerability / Software Security Multiple security vulnerabilities have been disclosed in the open-source private branch exchange (PBX) platform FreePBX, including a cri ... Read more
The following table lists the changes that have been made to the
CVE-2025-66039 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Dec. 09, 2025
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-287 Added Reference https://github.com/FreePBX/framework/commit/04224253156543cd9932b90458660b2f19fc0e35#diff-72f14a52840a61504a8e03cd195035b44e488aecd634b001bc6412a04bdc940bR20-R50 Added Reference https://github.com/FreePBX/security-reporting/security/advisories/GHSA-9jvh-mv6x-w698 Added Reference https://www.freepbx.org/watch-what-we-do-with-security-fixes-%f0%9f%91%80