CVE-2026-12378: CWE-502 Deserialization of Untrusted Data in Appointment Booking Calendar Plugin and Scheduling Plugin
The Appointment Booking Calendar Plugin and Scheduling Plugin for WordPress up to version 1.1.28 contains a deserialization vulnerability. It does not validate data before passing it to a PHP deserialization function, allowing unauthenticated attackers to inject arbitrary PHP objects. If a suitable gadget chain exists on the site, this vulnerability can be exploited to achieve remote code execution.
AI Analysis
Technical Summary
CVE-2026-12378 is a deserialization of untrusted data vulnerability (CWE-502) in the Appointment Booking Calendar Plugin and Scheduling Plugin for WordPress through version 1.1.28. The plugin fails to validate input before deserializing PHP objects, enabling unauthenticated attackers to inject malicious objects. Exploitation requires the presence of a gadget chain on the target site to escalate this to remote code execution. No CVSS score or vendor advisory is currently available, and no patch or remediation guidance has been published.
Potential Impact
Successful exploitation can lead to remote code execution on the affected WordPress site, potentially allowing attackers to execute arbitrary code with the privileges of the web server. This poses a critical security risk including full site compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the plugin functionality if possible and monitor for updates from the vendor. Avoid exposing the affected plugin to untrusted users.
CVE-2026-12378: CWE-502 Deserialization of Untrusted Data in Appointment Booking Calendar Plugin and Scheduling Plugin
Description
The Appointment Booking Calendar Plugin and Scheduling Plugin for WordPress up to version 1.1.28 contains a deserialization vulnerability. It does not validate data before passing it to a PHP deserialization function, allowing unauthenticated attackers to inject arbitrary PHP objects. If a suitable gadget chain exists on the site, this vulnerability can be exploited to achieve remote code execution.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-12378 is a deserialization of untrusted data vulnerability (CWE-502) in the Appointment Booking Calendar Plugin and Scheduling Plugin for WordPress through version 1.1.28. The plugin fails to validate input before deserializing PHP objects, enabling unauthenticated attackers to inject malicious objects. Exploitation requires the presence of a gadget chain on the target site to escalate this to remote code execution. No CVSS score or vendor advisory is currently available, and no patch or remediation guidance has been published.
Potential Impact
Successful exploitation can lead to remote code execution on the affected WordPress site, potentially allowing attackers to execute arbitrary code with the privileges of the web server. This poses a critical security risk including full site compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the plugin functionality if possible and monitor for updates from the vendor. Avoid exposing the affected plugin to untrusted users.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-06-16T08:51:08.047Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4df1ebc9d9e3dbe3a03222
Added to database: 07/08/2026, 06:44:59 UTC
Last enriched: 07/08/2026, 06:58:19 UTC
Last updated: 07/08/2026, 07:46:42 UTC
Views: 27
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.