CVE-2026-46376 FreePBX: Unauthenticated Use of Hard-Coded Credentials Vulnerability in FreePBX UCP Interface
Unauthenticated attackers can access the User Control Panel using hard-coded initial template credentials if the administrator fails to change them after enabling the feature.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-46376?
CVE-2026-46376 is a critical vulnerability in Sangoma Freepbx, published on 29 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-798
Which versions are affected by CVE-2026-46376?
It affects 1 product.
Products include Sangoma Freepbx.
How do I fix CVE-2026-46376?
No fix has been published for CVE-2026-46376 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-46376 being exploited?
There is no known exploitation of CVE-2026-46376 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Sangoma Freepbx
- CVE-2025-57819 Sangoma FreePBX Authentication Bypass
- CVE-2019-19006 Sangoma FreePBX Improper Authentication
- CVE-2026-73663 FreePBX: Unauthenticated SQL injection in FreePBX missedcall via inbound Caller ID name leads to administrator takeover
- CVE-2026-73665 FreePBX UCP: Unauthenticated remote code execution via socket.io namespace auth bypass and AMI action injection
- CVE-2025-66039 FreePBX Endpoint Manager Allows Unauthenticated Logins to Administrator Control Panel via Forged Basic Auth Header
Sources
Also known as GHSA-m55x-h47x-v3gx.