WordPress security changelog
MEDIUM CVE-2026-12111 Deferred

Appointment Booking Calendar: Sensitive information exposure

Appointment Booking Calendar is affected by sensitive information exposure. Exploitation requires at least contributor-level access. Successful exploitation can disclose data that should not be available to the caller. The published affected range is <= 1.4.01.

CVE / CNA score 4.3 CVSS 3.1 · security@wordfence.com
NVD score Pending NVD has not published its own CVSS assessment.
Component
Appointment Booking Calendar
Plugin slug
appointment-booking-calendar
Affected
<= 1.4.01
Safe version
> 1.4.01
Published
Jun 18, 2026
Weakness
CWE-200 — Exposure of Sensitive Information to an Unauthorized Actor

This CVE was published Jun 18, 2026 and is one of 16 known issues for this plugin.

What to do

Update, patch or deactivate.

Update Appointment Booking Calendar to a release after 1.4.01, 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 Appointment Booking Calendar plugin for WordPress is vulnerable to Sensitive Information Exposure in versions up to, and including, 1.4.01. This is due to insufficient authorization and missing per-calendar ownership checks in the cpabc_appointments_calendar_load2() function, which is reachable via the cpabc_calendar_load2=1 query parameter in wp-admin and only checks is_admin() && current_user_can('edit_posts'), a capability available to Contributor-level users and above. This makes it possible for authenticated attackers with Contributor-level access and above to supply an arbitrary calendar ID via the id parameter and extract customer booking information, including email addresses, names, phone numbers, booking times, and comments, from any calendar managed by the plugin.

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

References

Primary and upstream sources