wpdevelop Booking Calendar Plugin up to 11.4.3 on WordPress wpbc_is_show_popover_in_flex_timeline information disclosure

Summaryinfo

A vulnerability was found in wpdevelop Booking Calendar Plugin up to 11.4.3. It has been rated as problematic. This impacts the function wpbc_is_show_popover_in_flex_timeline. Performing a manipulation results in information disclosure. This vulnerability was named CVE-2026-18496. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in wpdevelop Booking Calendar Plugin up to 11.4.3. This affects the function wpbc_is_show_popover_in_flex_timeline. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

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.

The advisory is shared at wordfence.com. This vulnerability is uniquely identified as CVE-2026-18496 since 07/31/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/10/2026). MITRE ATT&CK project uses the attack technique T1592 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• wpdevelop

Name

• Booking Calendar Plugin

Version

• 11.4.0
• 11.4.1
• 11.4.2
• 11.4.3

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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