CVE-2025-13317 Missing authorization in Appointment Booking Calendar
Unauthenticated attackers can arbitrarily confirm bookings and trigger notifications by exploiting a missing authorization check in the Appointment Booking Calendar plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-13317?
CVE-2025-13317 is a medium-severity missing authorization vulnerability in codepeople Appointment Booking Calendar, published on 22 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2025-13317?
How do I fix CVE-2025-13317?
No fix has been published for CVE-2025-13317 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-13317 being exploited?
There is no known exploitation of CVE-2025-13317 in the wild and no public exploit code.
Sources
Also known as GHSA-846p-mjq5-w3jq.