CVE-2026-12378 — HIGH (8.1)

Vulnerability 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.

CVSS Score

8.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

References

https://wpscan.com/vulnerability/eb3abb88-43c3-42a8-a8a8-2ad67d37e020/

FAQ

What is CVE-2026-12378?

CVE-2026-12378 is a vulnerability with a CVSS score of 8.1 (HIGH). 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 atta...

How severe is CVE-2026-12378?

CVE-2026-12378 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-12378?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.