CVE-2025-13317 json
Appointment Booking Calendar <= 1.3.96 - Missing Authorization to Arbitrary Booking Confirmation via 'cpabc_ipncheck' Parameter
published 2025-11-22 11 mo ago modified 2026-10-18 21 d ago also EUVD-2025-198537
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 22%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- codepeople appointment_booking_calendar 1.3.97
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 11 mo ago
Exploit prediction
0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected products
- codepeople Appointment Booking Calendar
Classification
- Weakness
-
- CWE-862 Missing Authorization
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/638217c4-7a37-49e4-8660-5510ace692ec?source=cve
- plugins.trac.wordpress.org /browser/appointment-booking-calendar/tags/1.3.96/inc/cpabc_apps_go.inc.php#L14
- plugins.trac.wordpress.org /browser/appointment-booking-calendar/tags/1.3.96/inc/cpabc_apps_go.inc.php#L363
- plugins.trac.wordpress.org /browser/appointment-booking-calendar/tags/1.3.96/inc/cpabc_apps_go.inc.php#L476
- plugins.trac.wordpress.org /changeset?sfp_email=&sfph_mail=&reponame=&old=3399113%40appointment-booking-calendar&new=3399113%40appointmen
Sources
- CVE List CVE-2025-13317
- NVD CVE-2025-13317
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.