Sensitive Information Exposure in Booking Calendar Plugin for WordPress
CVE-2026-18496

5.3MEDIUM

Key Information:

Vendor

WordPress
Status
Booking Calendar
Vendor
CVE Published:
10 October 2026

What is CVE-2026-18496?

The Booking Calendar plugin for WordPress contains a vulnerability that allows unauthenticated attackers to access sensitive customer information, such as names, email addresses, and phone numbers, through a flaw in the wpbc_is_show_popover_in_flex_timeline() function. All versions up to and including 11.4.3 are impacted, posing a significant risk to user data privacy. This vulnerability highlights the importance of regular updates and security best practices for WordPress plugins.

Affected Version(s)

Booking Calendar 0 <= 11.4.3

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/changeset/3633943/booking

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jonah Burgess (CryptoCat)
.