CVE-2026-87115: VikAppointments Services Booking Calendar <= 1.2.21 - Unauthenticated Arbitrary File Deletion via 'old_vapcfN' Parameter
The VikAppointments Services Booking Calendar plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the extract function in all versions up to, and including, 1.2.21. This makes it possible for unauthenticated attackers to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php). Exploitation requires at least one File-type custom field to be published on the confirmation page shortcode, as this field is not created by default during plugin installation.
Affected Software
Event History
Frequently Asked Questions
Are default installations affected?
Exploitation requires at least one published File-type custom field on the confirmation page shortcode. That field is not created by default during plugin installation, so a default installation without this configuration does not meet the stated exploitation requirement.
Does an attacker need an account or user interaction to exploit this?
No. The vulnerability is described as exploitable by unauthenticated attackers, with no user interaction required.
What is the practical impact if exploitation succeeds?
An attacker can delete arbitrary files on the server. Deleting a file such as wp-config.php can potentially lead to remote code execution.
How can I determine whether my site is exposed?
Check whether the plugin version is 1.2.21 or earlier and whether a File-type custom field is published on the confirmation page shortcode. Both conditions are identified as relevant to exploitation.