CVE-2026-12378 BookingPress <= 1.1.28 - Unauthenticated PHP Object Injection
Unauthenticated attackers can inject PHP objects to achieve remote code execution if a suitable gadget chain exists.
- 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-2026-12378?
CVE-2026-12378 is a high-severity unsafe deserialization vulnerability in Unknown Appointment Booking Calendar Plugin and Scheduling Plugin, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-12378?
How do I fix CVE-2026-12378?
No fix has been published for CVE-2026-12378 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-12378 being exploited?
There is no known exploitation of CVE-2026-12378 in the wild and no public exploit code.
Sources
Also known as GHSA-5jfm-f958-c6pr.