CVE-2026-95523 in WP User Frontend Plugin
Summary
by MITRE • 09/23/2026
Subscriber 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 authentication bypass flaw that allows unauthorized users to access administrative features and restricted content intended for subscribers. This plugin, which is widely used in the WordPress ecosystem to facilitate user registration, profile management, and frontend submission forms, suffered from insufficient validation of user capabilities during specific form processing operations. The core technical issue stems from improper checks on the current user's role or capability before executing actions that modify data or trigger administrative functions. By manipulating request parameters, an attacker can bypass these security controls, effectively elevating their privileges without needing valid credentials for higher-level roles such as administrator or editor.
From a technical perspective, this flaw is classified under CWE-287, which denotes Improper Authentication, and more specifically aligns with CWE-352 regarding Cross-Site Request Forgery if the bypass relies on state-changing requests that do not require proper CSRF tokens for non-administrative users. The vulnerability exploits the plugin's reliance on client-side or insufficient server-side validation of user roles when processing submissions through its frontend forms. In many instances, the application logic fails to verify whether the initiating request originates from a session with sufficient privileges before performing sensitive operations such as updating post metadata, changing user profiles in ways that affect site structure, or accessing protected API endpoints exposed by the plugin's integration points. This lack of robust server-side authorization checks allows malicious actors to craft requests that appear legitimate but carry elevated permissions due to the flawed logic handling role verification.
The operational impact of this vulnerability is severe for website administrators and their users. An attacker with basic subscriber-level access or even unauthenticated status, depending on the specific vector exploited within the plugin's various forms, can perform actions reserved for higher-tier roles. This could include creating new administrator accounts, modifying site settings that affect security configurations, accessing private content meant only for logged-in subscribers, or injecting malicious code through profile fields if sanitization is also compromised alongside authorization checks. The ability to bypass subscriber restrictions undermines the fundamental trust model of multi-user WordPress sites, potentially leading to data breaches, defacement, or further exploitation such as remote code execution if combined with other vulnerabilities in theme files or server configurations that accept user input without strict validation.
Mitigation strategies for this vulnerability primarily involve immediate updates and configuration hardening. Site administrators must upgrade WP User Frontend to version 4.3.12 or later, where the developers have patched these authorization checks by implementing stricter role verification logic before processing sensitive form submissions. Until an update is applied, temporary mitigations include restricting access to any forms that handle user data modifications via IP whitelisting if feasible, disabling public registration features until they can be audited, and ensuring that all other plugins are up to date to prevent chained attacks. Additionally, implementing Web Application Firewall rules that detect anomalous patterns in form submissions from low-privilege users attempting high-level actions can provide an additional layer of defense against exploitation attempts targeting this specific weakness.
This incident highlights the importance of adhering to secure coding practices where authorization checks are performed server-side and independently of client-supplied data, a principle emphasized by industry standards such as OWASP Top 10 under Broken Access Control categories. The ATT&CK framework categorizes similar behaviors under Tactic: Privilege Escalation with techniques like Exploitation for Credential Access or Abuse of Existing Cloud Infrastructure if applicable to the hosting environment, though in this context it is strictly local privilege escalation within the application layer. Continuous monitoring and regular security audits are essential to identify such logic flaws before they can be leveraged by malicious actors seeking unauthorized access to sensitive systems and data.