Auth bypass in Freepbx Framework
CVE-2025-66039
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.033 (88.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.033 · newest: 0.033 · change: 0.000
Affected products
- Freepbx Framework — versions < 16.0.44, >= 17.0.1, < 17.0.23
- Sangoma Freepbx
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/FreePBX/security-reporting/security/advisories/GHSA-9jvh-mv6x-w698 (Mitigation, Vendor Advisory)
- github.com/FreePBX/framework/commit/04224253156543cd9932b90458660b2f19fc0e35 (Product)
- www.freepbx.org/watch-what-we-do-with-security-fixes-👀 (Not Applicable, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-66039?
- CVE-2025-66039 is a critical-severity vulnerability in Freepbx Framework, classified under Improper Authentication. CVSS score: 9.8/10. Published 2025-12-09.
- How severe is CVE-2025-66039?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2025-66039 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.