What the vulnerability does
01Description
The Cost Calculator Builder plugin for WordPress is vulnerable to Unauthenticated Payment Status Bypass in all versions up to, and including, 3.6.9 only when used in combination with Cost Calculator Builder PRO. This is due to the complete_payment AJAX action being registered via wp_ajax_nopriv, making it accessible to unauthenticated users, and the complete() function only verifying a nonce without checking user capabilities or order ownership. Since nonces are exposed to all visitors via window.ccb_nonces in the page source, any unauthenticated attacker can mark any order's payment status as "completed" without actual payment.
Explanation of Vulnerability in Simple Terms
02Summary
Cost Calculator Builder through version 3.6.9 lacks proper authorization checks, allowing unauthenticated attackers to modify data via network requests. The vulnerability does not expose sensitive information or disrupt service availability, but permits unauthorized changes to calculator configurations or stored data. Site administrators should update to a version newer than 3.6.9 as soon as available.
What an attacker can do
03Attacker Capabilities
Modify calculator data or settings without authentication.
Potential impact on your site
04Site Impact
Attackers can alter calculator configurations, pricing rules, or stored form data without logging in.
Conditions required to exploit
05Prerequisites
Network access only; no authentication or user interaction required.
Key dates
06Disclosure timeline
January 16, 2026
CVE published
April 8, 2026
Record updated
