CVE-2026-73665 Details
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.
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Exploit prediction scoring system (EPSS) score for CVE-2026-73665
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.33 Probability of exploitation activity being observed over the next 30 days (25th percentile)
CVSS score for CVE-2026-73665
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
9.8 Critical
Products affected by CVE-2026-73665
Freepbx 13.0.190.19
Freepbx 13.0.190.7
Freepbx 13.0.191.11
Freepbx 13.0.192.16
Freepbx 13.0.192.19
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Low
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CVE-2026-73665 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 356 37.32%
CA 58 6.08%
DE 55 5.77%
RU 48 5.03%
GB 34 3.56%
BR 32 3.35%
FR 31 3.25%
UZ 30 3.14%
IE 28 2.94%
CN 19 1.99%

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CVE-2026-73665 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 442 72.10%
Telecommunications 151 24.63%
Education 4 0.65%
Utilities 2 0.33%
Business Services 2 0.33%
Healthcare/Wellness 2 0.33%
Retail 2 0.33%
Nonprofit/NGO 2 0.33%
Manufacturing 2 0.33%
Engineering 1 0.16%

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