What is CVE-2026-40520?

CVE-2026-40520 is a high-severity vulnerability in Freepbx Api, classified under OS Command Injection. CVSS score: 7.2/10. Published 2026-04-21.

How severe is CVE-2026-40520?

High severity. CVSS v3 base score is 7.2 out of 10.

RCE in Freepbx Api

CVE-2026-40520

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 auth…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.003 (55.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Freepbx Api — versions 0, 5f194e39a47e5481e8947f9694304d32724175f6

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

github.com/FreePBX/api/commit/5f194e39a47e5481e8947f9694304d32724175f6 (patch)
github.com/FreePBX/api/blob/5f194e39a47e5481e8947f9694304d32724175f6/Api.class… (related)
github.com/FreePBX/api/blob/5f194e39a47e5481e8947f9694304d32724175f6/ApiGqlHelp… (related)
www.vulncheck.com/advisories/freepbx-api-module-command-injection-via-graphql (third-party-advisory)

Frequently asked questions

What is CVE-2026-40520?: CVE-2026-40520 is a high-severity vulnerability in Freepbx Api, classified under OS Command Injection. CVSS score: 7.2/10. Published 2026-04-21.
How severe is CVE-2026-40520?: High severity. CVSS v3 base score is 7.2 out of 10.