Medium severity · published Oct 10, 2026
CVE-2026-18496
Booking Calendar <= 11.4.3 - Unauthenticated Sensitive Information Exposure in 'WPBC_FLEXTIMELINE_NAV' AJAX Action
5.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BC
Booking Calendar · wpdevelop
through 11.4.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18496
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18496
www.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
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