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Critical · 9.3 Public exploit CVE-2026-73665 EUVD-2026-58541

FreePBX UCP: Unauthenticated remote code execution via socket.io namespace auth bypass and AMI action injection

Published Aug 13, 2026 · Updated Aug 18, 2026 · Assigned by GitHub_M

Vendor: FreePBX Product: ucp

Description

FreePBX is an open source IP PBX. Prior to 17.0.9, the UCP Node server on ports 8001 and 8003 uses io.use(checkAuth) in node/lib/server.js, but Socket.IO version 4 applies that middleware only to the default namespace. An unauthenticated client can connect to custom namespaces that do not consistently invoke checkAuth in node/lib/auth.js and send crafted event values containing carriage-return or newline characters through the Asterisk Manager Interface action path patched by node/lib/asterisk-manager-patch.js, allowing arbitrary commands to execute as the asterisk service user. This issue is fixed in version 17.0.9.

Affected products

VendorProductAffectedFixed
FreePBX ucp < 17.0.9 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • fixedbyreboot/CVE-2026-73665-POC ★ 0 · Nov 10, 2026

    POC exploit for CVE-2026-73665 - unauthenticated RCE in FreePBX UCP via Socket.IO namespace auth bypass feeding CRLF injection into the Asterisk Manager Interface. Vulnerable 17.0.7 lab vs patched UC…

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References