Is CVE-2026-40520 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-40520 being exploited in the wild.

How severe is CVE-2026-40520?

High severity, with a CVSS score of 7.2, published 21 April 2026.

Which products and versions are affected?

FreePBX Api Module 17.0.8 and prior.

Is there a fix for CVE-2026-40520?

A patch was published on 2026-04-21: Patch commit 5f194e3 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-40520 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-40520?

Check whether you run FreePBX Api Module at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-40520: FreePBX api module command injection in initiateGqlAPIProcess

CVE-2026-40520 · Severity: high · CVSS 7.2 · Published 2026-04-21

FreePBX is an open-source graphical user interface that manages Asterisk, a popular voice-over-IP (VoIP) and telephony server. A security flaw in its API module allows an authorized user to execute malicious commands on the server. This could lead to a complete takeover of the phone system, allowing attackers to intercept calls, access sensitive data, or disrupt communications.

Vendors: FreePBX.

Quick answers

Is CVE-2026-40520 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-40520 being exploited in the wild.
How severe is CVE-2026-40520?: High severity, with a CVSS score of 7.2, published 21 April 2026.
Which products and versions are affected?: FreePBX Api Module 17.0.8 and prior.
Is there a fix for CVE-2026-40520?: A patch was published on 2026-04-21: Patch commit 5f194e3 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-40520 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-40520?: Check whether you run FreePBX Api Module at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A command injection vulnerability exists in the FreePBX 'api' module within the initiateGqlAPIProcess() function. The root cause is the direct passing of GraphQL mutation input fields to the PHP shell_exec() function without proper sanitization or escaping. An authenticated attacker with a valid bearer token can exploit this by sending a GraphQL 'moduleOperations' mutation containing backtick-wrapped shell commands in the 'module' field. Successful exploitation allows for arbitrary command execution on the underlying host with the privileges of the web server user. A patch has been identified in commit 5f194e3.

Affected products

FreePBX api module 17.0.8 and prior

Timeline

2026-04-21: disclosed
2026-04-21: advisory
2026-04-21: patched: Patch commit 5f194e3 released

References

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