CVE-2026-95524 in WP User Frontend Plugin
Summary
by MITRE • 09/23/2026
Unauthenticated Bypass Vulnerability in WP User Frontend <= 4.3.11 versions.
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Analysis
by VulDB Data Team • 09/23/2026
The vulnerability identified within WP User Frontend versions prior to or equal to 4.3.11 represents a critical security flaw that allows unauthenticated attackers to bypass authentication mechanisms and gain unauthorized access to protected administrative functions or user data on WordPress websites utilizing this plugin. This type of vulnerability is fundamentally rooted in improper implementation of access control checks, where the application fails to properly verify whether an incoming request originates from an authenticated and authorized user before processing sensitive operations. In many cases involving such plugins, which serve as bridges between front-end forms and back-end database interactions, developers may rely on client-side validation or insufficient server-side token verification, creating a gap that malicious actors can exploit without needing valid credentials.
From a technical perspective, this flaw typically manifests when the plugin processes form submissions or AJAX requests intended for administrative tasks but fails to enforce strict nonce validation or session checks at critical junctures in the code execution flow. An attacker can craft specific HTTP requests that mimic legitimate user actions, effectively tricking the server into executing privileged commands such as creating new administrator accounts, modifying site settings, or accessing private user profiles. The absence of robust input sanitization and capability verification allows these crafted payloads to execute with elevated privileges, often equivalent to those of a super-administrator, thereby compromising the integrity of the entire WordPress installation.
The operational impact of this vulnerability is severe, as it directly undermines the confidentiality, integrity, and availability principles of information security. By exploiting this unauthenticated bypass, an attacker can take full control of the compromised website, leading to potential data breaches involving sensitive user information such as email addresses, hashed passwords, and personal details stored in the WordPress database. Furthermore, attackers may use the gained access to inject malicious code into theme files or plugins, facilitating persistent backdoors that allow for ongoing unauthorized access even after initial remediation attempts if not thoroughly cleaned. This can also lead to defacement of the website, distribution of malware to visitors through drive-by downloads, and inclusion in botnets for distributed denial-of-service attacks against other targets.
This vulnerability aligns with CWE-287, which describes Improper Authentication, specifically where an actor is able to bypass authentication mechanisms due to insufficient verification of identity or credentials. Additionally, it maps closely to the MITRE ATT&CK technique T1078, Valid Accounts, as attackers leverage valid system structures but exploit flaws in access control logic rather than stealing actual credential pairs initially. The exploitation path often involves reconnaissance followed by precise payload delivery via crafted HTTP requests targeting specific endpoints exposed by the plugin's API or form handling routines.
To mitigate this risk, immediate action is required to update WP User Frontend to version 4.3.12 or later, where these access control checks have been hardened and nonce validation has been strictly enforced for all administrative operations. Administrators should also implement Web Application Firewalls configured with rulesets capable of detecting anomalous request patterns associated with privilege escalation attempts. Regular security audits focusing on input validation and session management practices are essential to prevent similar vulnerabilities in custom code or other third-party plugins. Ensuring that only necessary endpoints remain accessible and disabling file editing capabilities within the WordPress dashboard further reduces the attack surface available to potential exploiters seeking to maintain persistence after initial compromise.