CVE-2026-40520: FreePBX api module version 17.0.8 and prior contain a command injection vulnerability in the initiateGqlAPIPro

Q: How do I fix CVE-2026-40520?

api: upgrade to 17.0.8. Exact commands for each OS are on this page.

Q: Is CVE-2026-40520 being exploited?

CVE-2026-40520 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40520 affect?

CVE-2026-40520 affects api. Severity is high (CVSS 7.2). FreePBX api module version 17.0.8 and prior contain a command injection vulnerability in the initiateGqlAPIProcess() function where GraphQL mutation input fields are passed directly to shell_exec() without sanitization or escaping. An authe

This month

HIGH 7.2UPGRADE

CVE-2026-40520 is a high-severity flaw (CVSS 7.2) affecting api. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FreePBX api module version 17.0.8 and prior contain a command injection vulnerability in the initiateGqlAPIProcess() function where GraphQL mutation input fields are passed directly to shell_exec() without sanitization or escaping. An authenticated user with a valid bearer token can send a GraphQL moduleOperations mutation with backtick-wrapped commands in the module field to execute arbitrary commands on the underlying host as the web server use

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-78
Published	2026-04-21
Last modified	2026-10-26

Publisher (CNA): VulnCheck · Vendor: freepbx

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 13:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

freepbx api UPGRADE

Affected: < 17.0.8

Fixed in: 17.0.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy api || rpm -q api || api --version

2. UPGRADE to 17.0.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade api

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade api

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40520?

api: upgrade to 17.0.8. Exact commands for each OS are on this page.

Is CVE-2026-40520 being exploited?

CVE-2026-40520 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40520 affect?

CVE-2026-40520 affects api. Severity is high (CVSS 7.2). FreePBX api module version 17.0.8 and prior contain a command injection vulnerability in the initiateGqlAPIProcess() function where GraphQL mutation input fields are passed directly to shell_exec() without sanitization or escaping. An authe

How urgent is CVE-2026-40520?

Priority 43/100. High severity

References

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