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CVE-2026-73665— FreePBX UCP: Unauthenticated remote code execution via socket.io namespace auth bypass and AMI action injection

Quick assessment

Affected
FreePBX ucp
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreePBX是FreePBX团队开源的一款基于Web的电话交换系统。 FreePBX 17.0.9之前版本存在授权问题漏洞，该漏洞源于UCP Node服务器中Socket.IO 4中间件仅应用于默认命名空间，导致未经身份验证的客户端可连接自定义命名空间并通过Asterisk Manager Interface发送包含回车或换行的特制事件值，可能导致任意命令以asterisk服务用户身份执行。

CVSS 9.3 · Critical EPSS 0.41% · P33

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreePBX ucp < 17.0.9 affected
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I. Basic Information for CVE-2026-73665

Vulnerability Information
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Vulnerability Title
FreePBX UCP: Unauthenticated remote code execution via socket.io namespace auth bypass and AMI action injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
FreePBX 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreePBX是FreePBX团队开源的一款基于Web的电话交换系统。 FreePBX 17.0.9之前版本存在授权问题漏洞，该漏洞源于UCP Node服务器中Socket.IO 4中间件仅应用于默认命名空间，导致未经身份验证的客户端可连接自定义命名空间并通过Asterisk Manager Interface发送包含回车或换行的特制事件值，可能导致任意命令以asterisk服务用户身份执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreePBX ucp < 17.0.9 -

II. Public POCs for CVE-2026-73665

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9207 chars
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III. Intelligence Information for CVE-2026-73665

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Vendor Advisories for CVE-2026-73665 (1)

Same Patch Batch · FreePBX · 2026-08-13 · 6 CVEs total

CVE-2026-73663 9.3 CRITICAL FreePBX: Unauthenticated SQL injection in FreePBX missedcall via inbound Caller ID name le
CVE-2026-73661 8.6 HIGH FreePBX: Authenticated Framework AUTHTYPE Can Be Restored From a Crafted Backup
CVE-2026-73664 8.6 HIGH FreePBX: Authenticated Arbitrary SSH Key Injection via Backup Module
CVE-2026-73662 7.6 HIGH Authenticated FreePBX Music RCE via mpg123 and Asterisk Call Files
CVE-2026-73660 7.5 HIGH FreePBX: Authenticated TTS AGI Command Injection Through TTS Name

IV. Related Vulnerabilities

Same vendor: FreePBX
Same weakness: CWE-862

V. Comments for CVE-2026-73665

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