CVE-2026-12111 Appointment Booking Calendar <= 1.4.01 - Authenticated (Contributor+) Sensitive Information Exposure via 'id' Parameter
Authenticated contributors can access sensitive customer booking data from any calendar due to missing ownership checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12111?
CVE-2026-12111 is a medium-severity missing authorization vulnerability in codepeople Appointment Booking Calendar, published on 18 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Appointment Booking Calendar plugin for WordPress is vulnerable to Sensitive Information Exposure in versions up to, and including, 1.4.01. This is due to insufficient authorization and missing per-calendar ownership checks in the cpabc_appointments_calendar_load2() function, which is reachable via the cpabc_calendar_load2=1 query parameter in wp-admin and only checks is_admin() && current_user_can('edit_posts'), a capability available to Contributor-level users and above. This makes it possible for authenticated attackers with Contributor-level access and above to supply an arbitrary calendar ID via the id parameter and extract customer booking information, including email addresses, names, phone numbers, booking times, and comments, from any calendar managed by the plugin.
Weakness: CWE-200
Which versions are affected by CVE-2026-12111?
How do I fix CVE-2026-12111?
No fix has been published for CVE-2026-12111 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-12111 being exploited?
There is no known exploitation of CVE-2026-12111 in the wild and no public exploit code.
Sources
Also known as GHSA-w9f2-px6f-gvmg.