CVE-2026-18496
Received Received - Intake

Sensitive Information Exposure in Booking Calendar WordPress Plugin

Publication date: 2026-10-10

Last updated on: 2026-10-10

Assigner: Wordfence

Description
The Booking Calendar plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 11.4.3 via the wpbc_is_show_popover_in_flex_timeline() function. This makes it possible for unauthenticated attackers to extract sensitive data including names, email addresses, and phone numbers of customers who have made bookings.

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Meta Information

Published
2026-10-10
Last Modified
2026-10-10
Generated
2026-10-10
AI Q&A
2026-10-10
EPSS Evaluated
N/A
NVD
CVE-2026-18496
EUVD
EUVD-2026-96086

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wpdevelop Booking Calendar 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

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Executive Summary

The Booking Calendar plugin for WordPress has a vulnerability that allows unauthenticated attackers to access sensitive customer data such as names, email addresses, and phone numbers. This occurs through a function called wpbc_is_show_popover_in_flex_timeline() in versions up to and including 11.4.3.

Detection Guidance

Check WordPress sites using the Booking Calendar plugin versions up to 11.4.3. Look for unauthorized access to booking data or unusual requests to the wpbc_is_show_popover_in_flex_timeline() function. Review server logs for suspicious activity targeting this endpoint.

Impact Analysis

If you use the affected Booking Calendar plugin, attackers could steal customer booking details without needing to log in. This could lead to privacy breaches, identity theft, or misuse of personal data for phishing or fraud.

Compliance Impact

This vulnerability likely violates GDPR and HIPAA by exposing personal data without authorization. Organizations using the plugin may face fines, legal action, or reputational damage for failing to protect sensitive customer information.

Mitigation Strategies

Update the Booking Calendar plugin to the latest version immediately. If an update is unavailable, consider disabling the plugin temporarily. Restrict access to sensitive booking data and review user permissions for the WordPress site.

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