---
cve: "CVE-2026-40520"
severity: "HIGH"
cvss: 8.6
epss: "1.4%"
vendor: "FreePBX"
kev: false
exploited: false
published: "2026-04-21 13:16:20"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T10:58:03+02:00"
---

# CVE-2026-40520

> 8.6 HIGH · 🧪 PoC

## Beschreibung

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 user.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Hoch | good |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- ca10ea7d9d72d118ab40484ec3f969aff25f685d (Commit)
- 5f194e39a47e5481e8947f9694304d32724175f6 (Commit)

## Referenzen

- <https://github.com/FreePBX/api/commit/5f194e39a47e5481e8947f9694304d32724175f6>
- <https://github.com/FreePBX/api/blob/5f194e39a47e5481e8947f9694304d32724175f6/Api.class.php#L546C1-L554C3>
- <https://github.com/FreePBX/api/blob/5f194e39a47e5481e8947f9694304d32724175f6/ApiGqlHelper.class.php#L34C1-L36C136>
- <https://www.vulncheck.com/advisories/freepbx-api-module-command-injection-via-graphql>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-40520) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_