FreePBX api module Command Injection via GraphQL
Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.
cve-program · CVE-2026-40520
PublishedFreePBX 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.
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CVE-2026-40520 · CVE overview and exploitation status
cve-program · CVE-2026-40520
- 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
This historical advisory does not include today's related changes. Open the latest advisory to find current connections.