CVE-2026-40520 FreePBX api module Command Injection via GraphQL
Authenticated attackers can execute arbitrary commands on the host via GraphQL mutations in the FreePBX API module.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40520?
CVE-2026-40520 is a high-severity command injection vulnerability in FreePBX api, published on 21 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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.
Weakness: CWE-78
Which versions are affected by CVE-2026-40520?
It affects 1 product.
Products include Freepbx Api.
How do I fix CVE-2026-40520?
No fix has been published for CVE-2026-40520 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-40520 being exploited?
There is no known exploitation of CVE-2026-40520 in the wild and no public exploit code.
Sources
Also known as CVE-2026-41410, GHSA-h2vx-h73q-6q6w.