5.3
MediumCVSS 3.1 · from Wordfence
CVE-2025-13317
Appointment Booking Calendar <= 1.3.96 - Missing Authorization to Arbitrary Booking Confirmation via 'cpabc_ipncheck' Parameter
Appointment Booking Calendar · Missing authorization · CWE-862AffectedAppointment Booking Calendar
FixNo fix listed yet.
PublishedNov 22, 2025, 07:29 · Wordfence
ScoredNov 22, 2025 · 5.3 · Wordfence
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:07 UTC
What we know
No known exploitation. CISA KEV, checked 22:07 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.
An attacker only needs network access to the target. No login needed. CVSS: network, no privileges.
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.
From Wordfence
Affected and fixed versions
ProductAffectedFixed inAppointment Booking Calendarup to 1.3.96–
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known