CVE-2026-18496

MEDIUM 5.3

Booking Calendar <= 11.4.3 - Unauthenticated Sensitive Information Exposure in 'WPBC_FLEXTIMELINE_NAV' AJAX Action

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-200
Vendor	wpdevelop
Product	booking calendar
Published	Oct 10, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

wpdevelop / Booking Calendar

0 ≤ 11.4.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/1ebfb030-c9b7-477a-8fe3-78e97da6bea9?source=cve plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/changeset/3633943/booking

Credits

Jonah Burgess (CryptoCat)