CVE-2026-86839: CWE-639 Authorization Bypass Through User-Controlled Key in Online Scheduling and Appointment Booking System
The Online Scheduling and Appointment Booking System WordPress plugin before 28.3 does not verify that appointment and payment records requested through its staff-role AJAX actions belong to the requesting staff member, allowing authenticated attackers with a staff-level account to view, modify and delete other staff members' appointments and payments, including the associated customer's personal information.
AI Analysis
Technical Summary
CVE-2026-86839 is an authorization bypass vulnerability in the Online Scheduling and Appointment Booking System WordPress plugin versions prior to 28.3. The plugin fails to verify that appointment and payment records accessed via staff-role AJAX actions belong to the requesting staff member. This flaw allows authenticated staff-level users to view, modify, and delete other staff members' appointments and payments, exposing sensitive customer data.
Potential Impact
Authenticated staff-level attackers can access and manipulate appointment and payment data of other staff members, including sensitive customer personal information. This could lead to unauthorized data disclosure, data tampering, and potential privacy violations.
Mitigation Recommendations
Upgrade the Online Scheduling and Appointment Booking System WordPress plugin to version 28.3 or later where this vulnerability is fixed. No other mitigation guidance is provided; applying the official update is the recommended remediation.
CVE-2026-86839: CWE-639 Authorization Bypass Through User-Controlled Key in Online Scheduling and Appointment Booking System
Description
The Online Scheduling and Appointment Booking System WordPress plugin before 28.3 does not verify that appointment and payment records requested through its staff-role AJAX actions belong to the requesting staff member, allowing authenticated attackers with a staff-level account to view, modify and delete other staff members' appointments and payments, including the associated customer's personal information.
CVSS v3.1
Score 3.8low
Affected software
Online Scheduling and Appointment Booking System
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-86839 is an authorization bypass vulnerability in the Online Scheduling and Appointment Booking System WordPress plugin versions prior to 28.3. The plugin fails to verify that appointment and payment records accessed via staff-role AJAX actions belong to the requesting staff member. This flaw allows authenticated staff-level users to view, modify, and delete other staff members' appointments and payments, exposing sensitive customer data.
Potential Impact
Authenticated staff-level attackers can access and manipulate appointment and payment data of other staff members, including sensitive customer personal information. This could lead to unauthorized data disclosure, data tampering, and potential privacy violations.
Mitigation Recommendations
Upgrade the Online Scheduling and Appointment Booking System WordPress plugin to version 28.3 or later where this vulnerability is fixed. No other mitigation guidance is provided; applying the official update is the recommended remediation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-08T14:43:22.104Z
- State
- PUBLISHED
Threat ID: 6ab8b2d5f7a7c54106aa92d7
Added to database: 09/27/2026, 06:08:21 UTC
Last enriched: 09/27/2026, 06:18:23 UTC
Last updated: 09/28/2026, 01:57:30 UTC
Views: 17
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