Appointment Booking Calendar Plugin and Scheduling Plugin Plugin Deserialization deserialization

Summaryinfo

A vulnerability classified as critical was found in Appointment Booking Calendar Plugin and Scheduling Plugin Plugin up to 1.1.28. Affected is an unknown function of the component Deserialization Handler. The manipulation results in deserialization. This vulnerability is reported as CVE-2026-12378. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Appointment Booking Calendar Plugin and Scheduling Plugin Plugin up to 1.1.28. It has been classified as critical. Affected is an unknown function of the component Deserialization Handler. The manipulation with an unknown input leads to a deserialization vulnerability. CWE is classifying the issue as CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at wpscan.com. This vulnerability is traded as CVE-2026-12378 since 06/16/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/08/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Appointment Software

Name

• Appointment Booking Calendar Plugin and Scheduling Plugin Plugin

Version

• 1.1.0
• 1.1.1
• 1.1.2
• 1.1.3
• 1.1.4
• 1.1.5
• 1.1.6
• 1.1.7
• 1.1.8
• 1.1.9
• 1.1.10
• 1.1.11
• 1.1.12
• 1.1.13
• 1.1.14
• 1.1.15
• 1.1.16
• 1.1.17
• 1.1.18
• 1.1.19
• 1.1.20
• 1.1.21
• 1.1.22
• 1.1.23
• 1.1.24
• 1.1.25
• 1.1.26
• 1.1.27
• 1.1.28

CPE 2.3info

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