CVE-2025-66039

Name: CVE-2025-66039
Creator: NVD / NIST
Published: 2025-12-09T22:16:15.757+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.3/10EPSS 2.98%

Last modified Jun 17, 2026

CVE-2025-66039 is a critical-severity vulnerability rated 9.3/10 on the CVSS scale. 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. EPSS estimates a 2.98% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0

9.3/10

CVSS:4.0/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

EPSS Probability

2.98%

85.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Sangoma	Freepbx	< 16.0.44
Sangoma	Freepbx	>= 17.0.1, < 17.0.23

References

https://github.com/FreePBX/framework/commit/04224253156543cd9932b90458660b2f19fc0e35#diff-72f14a52840a61504a8e03cd195035b44e488aecd634b001bc6412a04bdc940bR20-R50Product
https://github.com/FreePBX/security-reporting/security/advisories/GHSA-9jvh-mv6x-w698Mitigation, Vendor Advisory
https://www.freepbx.org/watch-what-we-do-with-security-fixes-%f0%9f%91%80Not Applicable, Vendor Advisory

Timeline

Published: Dec 9, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-66039?

How severe is CVE-2025-66039?

CVE-2025-66039 has a CVSS score of 9.3/10 (CRITICAL severity). The EPSS model estimates a 2.98% probability of exploitation in the next 30 days.

How do I fix CVE-2025-66039?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-66039?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST