Vulnerability Intelligence Report
FreePBX UCP: Unauthenticated remote code execution via socket.io namespace auth bypass and AMI action injection
CVE-2026-73665
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.
No Active Exploit Signals
CVSS Base Score
9.3
CRITICAL
EPSS Probability:0.29%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-862 ↗CWE-862: Missing Authorization
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| FreePBX | ucp | < 17.0.9 (affected) |
Threat Intelligence Signals
EPSS Score
0.295%
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | GitHub, Inc. · Vendor · USA |
| Reserved | 2026-08-13T14:04:09 |
| Published | 2026-08-13T21:32:02 |
| Last Updated | 2026-08-18T01:41:24 |
Community Chatter & Buzz