Advanced Appointment Booking & Scheduling <= 2.6 - Unauthenticated Missing Authorization to User Registration Bypass via [appointment_register_form] Shortcode
- ID
- WPSEC-2026-2292
- Plugin
- Advanced Appointment Booking & Scheduling (advanced-appointment-booking-scheduling)
- Affected
- all versions before 2.7
- Remediation
- Update to 2.7 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness
- CWE-862
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-11-03
- Attack surface
- Advanced Appointment Booking & Scheduling on WPSec AttackSurface
- Fix released
- Published
Also published later by Another source as CVE-2026-81422, on 2026-11-06.
Description
The Advanced Appointment Booking & Scheduling plugin for WordPress is vulnerable to unauthorized user registration via the [appointment_register_form] shortcode in all versions up to, and including, 2.6, due to the registration handler not checking the site's 'Anyone can register' (users_can_register) setting before calling wp_insert_user. This makes it possible for unauthenticated attackers to create and log in to new user accounts with the site's default role even when the administrator has disabled user registration. The plugin publishes a 'Register' page containing this shortcode when it is activated.
References
- https://wpsec.com/vuln/WPSEC-2026-2292/
- https://plugins.svn.wordpress.org/advanced-appointment-booking-scheduling/tags/2.7/
- https://wordpress.org/plugins/advanced-appointment-booking-scheduling/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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