Description
### Impact
Lack of input validation of the Zendesk subdomain could expose users of the library to Server Side Request Forgery (SSRF).
### Resolution
Validate the provided Zendesk subdomain to be a valid subdomain in:
* getAuthUrl
* getAccessToken
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | zendesk/zendesk_api_client_php | < 2.2.11 | 2.2.11 | GHSA-q348-f93x-9gx4 |