Knight Squad Academy
Vulnerability advisory

CVE-2026-6810

Research by Md. Moniruzzaman Prodhan April 24, 2026
Overview

Summary

The Booking Calendar Contact Form plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.2.63 via the dex_bccf_admin_int_calendar_list.inc.php file due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with Subscriber-level access and above, to takeover other user's calendars and view user data associated with the calendar.

Risk profile

CVSS assessment

5.3 · M E D I U M
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
N E T W O R K
Complexity
L O W
Privileges
N O N E
User interaction
N O N E
Scope
U N C H A N G E D
Confidentiality
N O N E
Integrity
L O W
Availability
N O N E
Classification

Weaknesses

  • Authorization Bypass Through User-Controlled Key CWE-639
Further reading

References

8 sources
  1. plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/booking-calendar-contact-form/tags/1.2.63/dex_bccf.php#L608
  2. plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/booking-calendar-contact-form/tags/1.2.63/dex_bccf_admin_int_calendar_list.inc.php#L38
  3. plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/booking-calendar-contact-form/tags/1.2.63/dex_bccf_admin_int_calendar_list.inc.php#L71
  4. plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/booking-calendar-contact-form/trunk/dex_bccf.php#L608
  5. plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/booking-calendar-contact-form/trunk/dex_bccf_admin_int_calendar_list.inc.php#L38
  6. plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/booking-calendar-contact-form/trunk/dex_bccf_admin_int_calendar_list.inc.php#L71
  7. plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3512197%40booking-calendar-contact-form&new=3512197%40booking-calendar-contact-form&sfp_email=&sfph_mail=
  8. www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/a3977d10-239d-4b83-ab0c-ad165485498d?source=cve