CVE-2026-12378: The Appointment Booking Calendar Plugin and Scheduling Plugin WordPress plugin through 1.1.28 does not validate data before passing it to a PHP deserialization function, allowing
The Appointment Booking Calendar Plugin and Scheduling Plugin WordPress plugin through 1.1.28 does not validate data before passing it to a PHP deserialization function, allowing unauthenticated attackers to inject arbitrary PHP objects; where a suitable gadget chain is present on the site this can be leveraged to achieve remote code execution.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-12378
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-123780.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-12378 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for Appointment Booking Calendar
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- mediumCVE-2026-15289: The Booking calendar, Appointment Booking System plugin for WordPress is vulnerable to time-ba…nvd · 2026-07-10
- mediumCVE-2026-12433: The Hydra Booking – Appointment Scheduling & Booking Calendar plugin for WordPress is vulnerab…nvd · 2026-07-09
- highCVE-2026-5356: The LatePoint – Calendar Booking Plugin for Appointments and Events plugin for WordPress is vul…nvd · 2026-07-08
- mediumCVE-2026-11398: The LatePoint – Calendar Booking Plugin for Appointments and Events plugin for WordPress is vu…nvd · 2026-07-03
- mediumCVE-2026-12657: The LatePoint – Calendar Booking Plugin for Appointments and Events plugin for WordPress is vu…nvd · 2026-07-02
- highCVE-2026-13228: The LatePoint – Calendar Booking Plugin for Appointments and Events plugin for WordPress is vu…nvd · 2026-07-01
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