FreePBX UCP: Unauthenticated remote code execution via socket.io namespace auth bypass and AMI action injection (CVE-2026-73665) | HOL Guard CVE

Critical · CVSS 9.3CVE-2026-73665

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

Answer in brief

CVE-2026-73665 records a Critical severity (CVSS 9.3) vulnerability in FreePBX UCP: Unauthenticated remote code execution via socket.io namespace auth bypass and AMI action injection. The current sources do not mark it as known exploited. The current feed maps FreePBX/ucp (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 13, 2026Updated Sep 10, 2026Source checked Sep 28, 2026First seen by HOL Aug 13, 2026Material review Sep 10, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps FreePBX/ucp (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
FreePBX/ucpgeneric	< 17.0.9	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for FreePBX/ucp.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 13, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.