WordPress security changelog
MEDIUM CVE-2026-6810 Deferred

Booking Calendar Contact Form: A security weakness

Booking Calendar Contact Form is affected by a security weakness. Exploitation requires at least subscriber-level access. The resulting impact depends on how the affected component exposes the vulnerable operation. The published affected range is <= 1.2.63.

CVE / CNA score 5.3 CVSS 3.1 · security@wordfence.com
NVD score Pending NVD has not published its own CVSS assessment.
Component
Booking Calendar Contact Form
Plugin slug
booking-calendar-contact-form
Affected
<= 1.2.63
Safe version
> 1.2.63
Published
Apr 24, 2026
Weakness
CWE-639 — Authorization Bypass Through User-Controlled Key

This CVE was published Apr 24, 2026 and is one of 11 known issues for this plugin.

What to do

Update, patch or deactivate.

Update Booking Calendar Contact Form to a release after 1.2.63, or disable and remove it until a fixed version is available.

A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical description

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.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

Primary and upstream sources