Challan <= 3.7.58 - Cross-Site Request Forgery to Arbitrary Options Update

The Challan plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 3.7.58. This is due to missing or incorrect nonce validation on the woo_invoice_settings() function. This makes it possible for unauthenticated attackers to update arbitrary options that can make privilege escalation possible via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.