CVE-2026-18496 Booking Calendar <= 11.4.3 - Unauthenticated Sensitive Information Exposure in 'WPBC_FLEXTIMELINE_NAV' AJAX Action
Unauthenticated attackers can extract sensitive customer data like names and emails via an AJAX action in the Booking Calendar plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18496?
CVE-2026-18496 is a medium-severity vulnerability in wpdevelop Booking Calendar, published on 10 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-200
Which versions are affected by CVE-2026-18496?
How do I fix CVE-2026-18496?
No fix has been published for CVE-2026-18496 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-18496 being exploited?
There is no known exploitation of CVE-2026-18496 in the wild and no public exploit code.
Sources
Also known as GHSA-865w-3pc6-gq4c.