CVE-2026-93655
Received Received - Intake

Reflected Cross-Site Scripting in Booking Calendar WordPress Plugin

Publication date: 2026-09-22

Last updated on: 2026-09-22

Assigner: Wordfence

Description
The Booking Calendar plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'wpbc_auto_fill' parameter in all versions up to, and including, 11.8.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

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Meta Information

Published
2026-09-22
Last Modified
2026-09-22
Generated
2026-09-22
AI Q&A
2026-09-22
EPSS Evaluated
N/A
NVD
CVE-2026-93655
EUVD
EUVD-2026-84274

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wpbooking booking_calendar to 11.8.3 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

The Booking Calendar plugin for WordPress has a reflected cross-site scripting (XSS) vulnerability in the 'wpbc_auto_fill' parameter. This flaw exists in versions up to 11.8.3 due to insufficient input sanitization and output escaping. Attackers can inject malicious scripts that execute when a user clicks a crafted link.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the Booking Calendar plugin up to version 11.8.3. Check for suspicious URLs or scripts in the 'wpbc_auto_fill' parameter. Review server logs for unusual activity related to this parameter.

Impact Analysis

Unauthenticated attackers could trick users into clicking a malicious link, leading to arbitrary script execution in their browser. This may result in session hijacking, data theft, or unauthorized actions on behalf of the user.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, potentially violating GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations using the affected plugin may face compliance breaches if user data is compromised.

Mitigation Strategies

Immediately update the Booking Calendar plugin to the latest version beyond 11.8.3. If an update is unavailable, disable the plugin temporarily. Implement input sanitization for the 'wpbc_auto_fill' parameter and monitor for unusual web requests.

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