Reported vulnerability

Appointment Booking Calendar <= 1.4.01 - Authenticated (Contributor+) Sensitive Information Exposure via 'id' Parameter

Q: Which versions of Appointment Booking Calendar are affected?

Wordfence lists these affected versions: Start version unspecified, through 1.4.01. Use the version checker above to compare your installed release with this report.

Q: Is a fix available for Appointment Booking Calendar?

Wordfence reports a fix for this issue in Appointment Booking Calendar. It lists these fixed versions: 1.4.02. Back up your website and test the recommended update before applying it to your live site.

Q: Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Published 17 Jun 2026

Updated 18 Jun 2026

CVE-2026-12111

Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.

Does this affect my version?

Check your installed version against this advisory. This compares the report’s version ranges and does not scan your website.

Wordfence advisory

medium · CVSS 4.3

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.

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

Appointment Booking Calendar

Software: plugin · appointment-booking-calendar
Affected versions: Start version unspecified, through 1.4.01
Fix availability: Fix available
Fixed versions: 1.4.02

Recommended action

Update to version 1.4.02, or a newer patched version

Further references (1)

wordfence.com/threat-intel/vulnerabilities/id/e1ecc237-87b0-4c4d-94cc-d3af9c6669c5?source=api-prod

Data sources and licences

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CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

Read licence terms

Source: Wordfence

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Questions about this vulnerability

Which versions of Appointment Booking Calendar are affected?

Wordfence lists these affected versions: Start version unspecified, through 1.4.01. Use the version checker above to compare your installed release with this report.

Is a fix available for Appointment Booking Calendar?

Wordfence reports a fix for this issue in Appointment Booking Calendar. It lists these fixed versions: 1.4.02. Back up your website and test the recommended update before applying it to your live site.

Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Does an affected version mean my website has been hacked?

An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.

These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.

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