Appointment Booking Calendar <= 1.3.96 - Missing Authorization to Arbitrary Booking Confirmation via 'cpabc_ipncheck' Parameter
| CVE | CVE-2025-13317 |
|---|---|
| CVSS | 5.3 (Medium) |
| Publicly Published | November 21, 2025 |
| Last Updated | November 22, 2025 |
| Researcher |
Md. Moniruzzaman Prodhan (NomanProdhan)
- Knight Squad
|
Description
The Appointment Booking Calendar plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 1.3.96. This is due to the plugin exposing an unauthenticated booking processing endpoint (cpabc_appointments_check_IPN_verification) that trusts attacker-supplied payment notifications without verifying their origin, authenticity, or requiring proper authorization checks. This makes it possible for unauthenticated attackers to arbitrarily confirm bookings and insert them into the live calendar via the 'cpabc_ipncheck' parameter, triggering administrative and customer notification emails and disrupting operations.
References
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
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Vulnerability Details for Appointment Booking Calendar
| Software Type | Plugin |
|---|---|
| Software Slug | appointment-booking-calendar (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 1.3.97, or a newer patched version |
| Affected Version |
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| Patched Version |
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Recent vulnerabilities in Appointment Booking Calendar
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