The Booking Calendar Contact Form plugin contains a missing authorization check in the dex_bccf_check_IPN_verification function. This flaw allows an attacker with no authentication to trigger the dex_bccf_ipn parameter, causing the plugin to confirm bookings as if a payment had been received. The result is that services can be booked and accessed without payment, potentially leading to revenue loss and service abuse.

WordPress sites running the Booking Calendar Contact Form plugin from codepeople; all versions up to and including 1.2.60 are vulnerable.

The CVSS score of 5.3 indicates moderate severity, while the EPSS score of less than 1% suggests a low likelihood of exploitation. The vulnerability is not listed in the CISA KEV catalog. Because the flaw relies on a public WordPress endpoint and requires no authentication, it can be exploited by unauthenticated users via a crafted HTTP request, making the attack vector remote web-based.