CVE-2026-12393 Overview
CVE-2026-12393 is an Insecure Direct Object Reference (IDOR) vulnerability [CWE-639] in the WPS Bookings for WooCommerce WordPress plugin. Versions prior to 3.11.7 fail to verify that a booking order belongs to the requesting user before processing cancellation requests. Any authenticated user, including low-privilege roles such as Subscriber or Customer, can cancel and void booking orders belonging to other customers. The flaw affects the plugin's booking cancellation workflow and requires only a valid authenticated session on the target WordPress site.
Critical Impact
Authenticated attackers with minimal privileges can cancel arbitrary customer bookings, disrupting business operations and voiding legitimate reservations without the affected customer's consent.
Affected Products
- WPS Bookings for WooCommerce WordPress plugin versions prior to 3.11.7
- WordPress sites running WooCommerce with the affected plugin
- E-commerce and reservation platforms relying on WPS Bookings for order management
Discovery Timeline
- 2026-07-17 - CVE-2026-12393 published to NVD
- 2026-07-17 - Last updated in NVD database
Technical Details for CVE-2026-12393
Vulnerability Analysis
The vulnerability stems from missing authorization checks in the booking cancellation handler. The plugin accepts a booking or order identifier from an authenticated request and processes cancellation without validating that the requesting user owns the referenced booking. This is a classic Insecure Direct Object Reference pattern where server-side authorization is deferred to the client or omitted entirely.
Exploitation requires only a valid authenticated session. WordPress sites that permit open user registration, including those using WooCommerce Customer accounts or Subscriber registration, expose this attack surface to anyone on the internet. Successful exploitation impacts the integrity and availability of booking data, voiding legitimate customer reservations and disrupting merchant operations.
Root Cause
The plugin's cancellation endpoint performs authentication but not authorization. It confirms the request originates from a logged-in user but does not compare the booking's owning user ID against the current session's user ID. This omission maps directly to [CWE-639: Authorization Bypass Through User-Controlled Key].
Attack Vector
An attacker registers or logs into a Subscriber or Customer account on the target WordPress site. The attacker then submits a cancellation request referencing a booking order ID that belongs to a different user. The server processes the request, cancels the booking, and voids the order. Booking IDs are typically sequential integers, making enumeration trivial. Refer to the WPScan Vulnerability Report for additional technical detail.
Detection Methods for CVE-2026-12393
Indicators of Compromise
- Unexpected booking cancellations reported by customers who did not initiate them
- Cancellation requests in WordPress access logs originating from user accounts unrelated to the affected booking
- Multiple cancellation requests from a single low-privilege account targeting sequential booking IDs
- Spikes in cancellation activity outside normal business hours or from atypical IP ranges
Detection Strategies
- Audit WooCommerce order history for cancellations where the acting user does not match the order owner
- Correlate WordPress authentication logs with cancellation events to identify cross-account activity
- Deploy web application firewall rules to inspect cancellation endpoint requests for user-object mismatches
- Enable verbose logging on the WPS Bookings plugin to capture the user ID and booking ID for each cancellation
Monitoring Recommendations
- Alert on any single account issuing more than a small threshold of cancellations in a short time window
- Monitor for enumeration patterns targeting sequential booking or order identifiers
- Track new Subscriber or Customer account registrations followed by immediate cancellation attempts
- Review database changes to wp_posts and WooCommerce order meta tables for unauthorized state transitions
How to Mitigate CVE-2026-12393
Immediate Actions Required
- Update the WPS Bookings for WooCommerce plugin to version 3.11.7 or later without delay
- Audit recent booking cancellations to identify unauthorized activity and restore affected orders
- Review WordPress user registration settings and restrict open registration where not required
- Notify affected customers whose bookings were cancelled without their consent
Patch Information
The vendor addressed the vulnerability in version 3.11.7 of the WPS Bookings for WooCommerce plugin by adding ownership verification to the booking cancellation handler. Site administrators should apply the update through the WordPress plugin management interface. Detailed vendor information is available in the WPScan Vulnerability Report.
Workarounds
- Temporarily disable the WPS Bookings plugin until patching is complete if active exploitation is suspected
- Restrict Subscriber and Customer account creation to trusted users during the remediation window
- Deploy web application firewall rules to block cancellation requests where the session user does not match the target booking owner
- Enforce additional verification such as email confirmation for booking cancellations at the application layer
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
