CVE-2026-46376

CRITICAL

FreePBX UCP - Hardcoded Template Credentials

Title source: manual
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-46376. PoCs published by portbuster1337.

AI-analyzed exploit summary The repository contains a functional Python exploit for CVE-2026-46376, which leverages hard-coded credentials in FreePBX's userman module to achieve unauthenticated access to the User Control Panel (UCP). The PoC includes multiple exploitation methods, including credential-based login, unlock key bypass, and default admin credential testing.

Description

FreePBX is an open source IP PBX. From 15.0.42 to before 16.0.45 and 17.0.7, unauthenticated users may be able to access the User Control Panel (UCP) using hard-coded initial template credentials if these were not immediately changed by the Administrator who enabled UCP. Authenticated access to ACP is required for the initial setup of UCP generic templates, but after that, without further steps by the admin, unauthenticated users may be able to gain access. This vulnerability is fixed in 16.0.45 and 17.0.7.

Exploits (1)

nomisec WORKING POC
by portbuster1337 · poc
https://github.com/portbuster1337/CVE-2026-46376

The repository contains a functional Python exploit for CVE-2026-46376, which leverages hard-coded credentials in FreePBX's userman module to achieve unauthenticated access to the User Control Panel (UCP). The PoC includes multiple exploitation methods, including credential-based login, unlock key bypass, and default admin credential testing.

Classification
Working Poc 100%
Attack Type
Auth Bypass
Complexity
Trivial
Reliability
Reliable
Target: FreePBX (15.0.42+, userman <= 16.0.44, userman <= 17.0.6)
No auth needed
Prerequisites: UCP generic template setup must have been performed by an administrator
devstral-2 · analyzed May 30, 2026 Full analysis →

References (1)

Core 1
Core References

Scores

CVSS v3 9.8
EPSS 0.0008
EPSS Percentile 24.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-798
Status published
Products (3)
FreePBX/security-reporting >= 15.0.42, < 16.0.45
FreePBX/security-reporting >= 17.0.1, < 17.0.7
sangoma/freepbx < 16.0.45
Published May 29, 2026
Tracked Since May 29, 2026