CVE-2026-57812
Summary
by MITRE • 07/13/2026
Missing Authorization vulnerability in NSquared Simply Schedule Appointments simply-schedule-appointments allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Simply Schedule Appointments: from n/a through <= 1.6.12.4.
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Analysis
by VulDB Data Team • 07/13/2026
This vulnerability represents a critical missing authorization flaw in the NSquared Simply Schedule Appointments plugin that exposes improper access control configurations. The weakness allows unauthorized users to bypass authentication mechanisms and gain access to appointment scheduling functionality that should be restricted to authorized administrators or users with proper privileges. This misconfiguration creates a pathway for attackers to manipulate appointment data, potentially leading to appointment conflicts, data breaches, or service disruption. The vulnerability affects all versions up to and including 1.6.12.4, indicating a prolonged period during which the security flaw remained unaddressed.
The technical implementation of this access control failure stems from inadequate validation of user permissions within the plugin's core functionality. When users attempt to access appointment management features, the system fails to properly verify whether the requesting user possesses the necessary authorization levels to perform such operations. This misconfiguration typically occurs when the application relies on insufficient permission checks or improperly configured role-based access controls that do not adequately enforce security boundaries.
The operational impact of this vulnerability extends beyond simple unauthorized access scenarios and can result in significant business disruption and data compromise. Attackers exploiting this flaw could potentially schedule appointments for themselves or others, modify existing booking details, or access sensitive customer information stored within the appointment system. This exposure creates opportunities for service abuse, revenue loss, and potential compliance violations depending on the nature of the scheduled services and customer data involved.
Security professionals should address this vulnerability through immediate patching of affected versions and implementation of proper access control measures. The recommended mitigation includes strengthening permission validation mechanisms throughout the plugin's codebase, implementing robust authentication checks before allowing any appointment-related operations, and conducting comprehensive security reviews of all access control implementations. Organizations should also consider deploying web application firewalls to monitor for suspicious access patterns and ensure that role-based access controls are properly configured to prevent unauthorized modifications to scheduling data.
This vulnerability aligns with CWE-285, which specifically addresses improper authorization within software systems, and represents a clear violation of the principle of least privilege. From an ATT&CK framework perspective, this weakness maps to privilege escalation techniques where adversaries exploit insufficient access control to gain elevated permissions within the application environment. The vulnerability demonstrates how seemingly minor configuration errors in access control can create significant security risks that persist across multiple versions and affect organizations relying on the affected plugin for their scheduling operations.
Organizations utilizing this plugin should conduct immediate assessments of their current access control configurations, implement proper user role management, and establish monitoring procedures to detect unauthorized access attempts. The remediation process requires careful attention to ensure that all appointment-related functions properly validate user permissions before executing any data modification operations. Additionally, regular security testing and code reviews should be implemented to prevent similar access control weaknesses from emerging in future development cycles.