CVE-2025-66039
CRITICALCVSS v3
9.8
CRITICAL
EPSS Score
32.6%
exploit probability
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical Details
- CVSS v3 Vector
- 3.1
- Published
- 12/9/2025
- Last Modified
- 2/2/2026
Frequently Asked Questions
What is 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.
Is CVE-2025-66039 actively exploited?
Active exploitation of CVE-2025-66039 has not been confirmed. The EPSS score is 32.6%, indicating the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2025-66039?
CVE-2025-66039 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string 3.1.
Is CVE-2025-66039 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.