---
id: CVE-2026-73663
title: FreePBX is an open source IP PBX
summary: >-
  FreePBX is an open source IP PBX. From 16.0.0 until 16.0.11 and 17.0.4, the
  FreePBX missedcall module places the inbound Caller ID name from crafted SIP
  From headers into the missedcalllog INSERT in agi-bin/missedcallnotify.php
  without e…
severity: none
cwe:
  - CWE-89
published: '2026-08-13'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:05:53.723'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73663'
references:
  - url: >-
      https://github.com/FreePBX/missedcall/commit/4ada1d6b280fc246e74babc8d52f4cd1509eff24
    label: security-advisories@github.com
  - url: >-
      https://github.com/FreePBX/missedcall/commit/710acdf51968db507b3f9c47ce3db006846cf44c
    label: security-advisories@github.com
  - url: >-
      https://github.com/FreePBX/security-reporting/security/advisories/GHSA-g27h-xf3q-h3rm
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00954
epssPercentile: 0.59879
ingestedAt: '2026-09-18T20:51:25.614Z'
---

## Overview

FreePBX is an open source IP PBX. From 16.0.0 until 16.0.11 and 17.0.4, the FreePBX missedcall module places the inbound Caller ID name from crafted SIP From headers into the missedcalllog INSERT in agi-bin/missedcallnotify.php without escaping or bound parameters. An unauthenticated caller can inject SQL when a monitored extension goes unanswered, corrupting the database and modifying FreePBX administrator accounts to obtain unauthorized remote access. This issue is fixed in versions 16.0.11 and 17.0.4.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.