CVE-2023-41957 in Simple Membership Plugin
Summary
by MITRE • 05/17/2024
Improper Privilege Management vulnerability in smp7, wp.Insider Simple Membership allows Privilege Escalation.This issue affects Simple Membership: from n/a through 4.3.4.
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Analysis
by VulDB Data Team • 03/26/2025
The CVE-2023-41957 vulnerability represents a critical improper privilege management flaw within the smp7 and wp.Insider Simple Membership plugin for WordPress platforms. This vulnerability specifically targets the privilege escalation mechanisms that govern user access controls and administrative functions within the membership management system. The issue manifests when the plugin fails to properly validate and enforce user role restrictions, creating a pathway for unauthorized users to gain elevated privileges beyond their intended access levels. The vulnerability affects all versions of the Simple Membership plugin from the initial release through version 4.3.4, indicating a persistent flaw that has remained unaddressed across multiple iterations of the software.
The technical implementation of this privilege escalation vulnerability stems from inadequate input validation and insufficient access control checks within the plugin's core functionality. When users interact with membership management features, the system should verify that each operation is performed by an authorized administrator or user with appropriate permissions. However, the smp7 component fails to properly authenticate and authorize these operations, allowing malicious actors to exploit the lack of proper privilege validation. This flaw typically occurs in the backend processing of membership-related requests where the plugin does not adequately check the current user's role or capabilities before executing administrative functions. The vulnerability can be exploited through various attack vectors including crafted API requests, direct URL manipulation, or by leveraging existing user sessions with insufficient privilege boundaries.
The operational impact of CVE-2023-41957 extends beyond simple unauthorized access to potentially enable complete system compromise. An attacker who successfully exploits this vulnerability can gain administrative privileges within the WordPress installation, allowing them to modify user accounts, alter membership tiers, access sensitive data, and potentially execute arbitrary code on the server. This privilege escalation capability undermines the fundamental security model of the membership system and can lead to widespread data breaches, unauthorized content modification, and potential lateral movement within the compromised network. The vulnerability is particularly dangerous in environments where the Simple Membership plugin is used for managing sensitive user data or controlling access to premium content, as it directly compromises the integrity of the entire membership ecosystem.
From a cybersecurity framework perspective, this vulnerability aligns with CWE-276, which addresses improper privilege management, and maps to ATT&CK technique T1078.004 for valid accounts and T1548.001 for abuse of privileges. Organizations should implement immediate mitigation strategies including patching to version 4.3.5 or later, which contains the necessary privilege validation fixes. Additionally, administrators should conduct thorough access control reviews, implement network segmentation to limit exposure, and monitor for suspicious authentication patterns. The remediation process should include disabling the affected plugin until proper patches are applied, conducting security audits of user permissions, and implementing multi-factor authentication for administrative accounts. Regular security assessments and vulnerability scanning should be performed to identify similar privilege management flaws in other plugins and core WordPress components, as this type of vulnerability remains prevalent in content management systems due to the complex nature of user role hierarchies and permission enforcement mechanisms.