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 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.

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