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CVE-2026-73665

Sangoma Freepbx broken access control

9.8 CRITICALEPSS 0.33%
  1. Published13 Aug 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Sangoma Freepbx< 17.0.9

Remediation

Fixed in
Sangoma Freepbx≥ 17.0.9

References

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Frequently asked

Is CVE-2026-73665 being actively exploited?

CVE-2026-73665 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.33%.

How severe is CVE-2026-73665?

CVE-2026-73665 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.33% probability of exploitation.

Which products are affected by CVE-2026-73665?

Affected products include Sangoma Freepbx.

How do I fix CVE-2026-73665?

Upgrade affected software to a fixed version, for example Sangoma Freepbx 17.0.9 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-73665 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.