codepeople Appointment Booking Calendar Plugin up to 1.4.01 on WordPress Query Parameter cpabc_appointments_calendar_load2 ID information disclosure

Summaryinfo

A vulnerability was found in codepeople Appointment Booking Calendar Plugin up to 1.4.01 on WordPress. It has been classified as problematic. The impacted element is the function cpabc_appointments_calendar_load2 of the component Query Parameter Handler. This manipulation of the argument ID causes information disclosure. This vulnerability is handled as CVE-2026-12111. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in codepeople Appointment Booking Calendar Plugin up to 1.4.01 on WordPress and classified as problematic. Affected by this vulnerability is the function cpabc_appointments_calendar_load2 of the component Query Parameter Handler. The manipulation of the argument id with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The weakness was released by Chloe Chamberland. The advisory is shared at wordfence.com. This vulnerability is known as CVE-2026-12111 since 06/12/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-37864). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Appointment Software

Vendor

• codepeople

Name

• Appointment Booking Calendar Plugin

Version

• 1.4.01

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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