---
id: CVE-2026-86839
title: >-
  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
  authent…
summary: >-
  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
  authent…
severity: low
cvss: 3.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-639
product: Online Scheduling and Appointment Booking System
affected:
  - online_scheduling_and_appointment_booking_system < 28.3
published: '2026-09-27'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T02:17:34.607'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86839'
references:
  - url: 'https://wpscan.com/vulnerability/3ab8b879-3ef7-4aa4-8620-1bde99697dcb/'
    label: contact@wpscan.com
tags:
  - nvd
  - cve.org
epss: 0.00132
epssPercentile: 0.02298
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-28T00:39:41.040285Z'
ingestedAt: '2026-09-27T06:43:46.830Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.