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CVE-2026-8840

MEDIUM 5.3 CVSS 3.1
Published
August 15, 2026
Last modified
August 20, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-862
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Description

The Booking calendar, Appointment Booking System plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 3.2.36. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to mark arbitrary reservations as paid or completed, cancel legitimate payments, auto-approve reservations, and trigger transactional booking emails by writing attacker-supplied payment status and transaction data directly into the payments table. The auto-approval of reservations is only triggered when the 'enable_psuccess_approval' site option is enabled, but payment status manipulation and email dispatch are exploitable regardless of that setting.

Affected WordPress components

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • wpdevart Booking calendar, Appointment Booking System — Up to and including 3.2.36

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.35/admin/controllers/Payment.php#L16
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.35/admin/controllers/Payment.php#L26
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.35/booking_calendar.php#L131
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.35/booking_calendar.php#L578
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.36/admin/controllers/Payment.php#L16
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.36/admin/controllers/Payment.php#L26
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.36/booking_calendar.php#L131
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.36/booking_calendar.php#L578
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/88409bb0-5cb0-4f63-b8f0-d72f54fa17b0?source=cve
  • nvd.nist.gov Official NVD record