---
id: CVE-2026-18496
title: >-
  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
summary: >-
  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 a…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-200
published: '2026-10-10'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T13:30:21.620'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18496'
references:
  - url: 'https://plugins.trac.wordpress.org/changeset/3633943/booking'
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/1ebfb030-c9b7-477a-8fe3-78e97da6bea9?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
epss: 0.00214
epssPercentile: 0.11692
ingestedAt: '2026-10-10T06:24:42.868Z'
vendor: wpdevelop
product: Booking Calendar
affected:
  - booking_calendar <= 11.4.3
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-11T16:41:38.015892Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.