What’s Vulnerable › Vulnerabilities
CVE-2026-73665: FreePBX UCP: Unauthenticated remote code execution via socket.io namespace auth bypass and AMI action injection
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-13 · updated 2026-10-09
- Weakness: CWE-862
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
- Sangoma FreePBX: before 17.0.9 — fixed in 17.0.9
How to fix
Upgrade to a fixed version: Sangoma FreePBX 17.0.9. Check the vendor advisory for mitigations.
References
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