CVE-2026-95525 in User Frontend Plugin
Summary
by MITRE • 09/23/2026
Subscriber Arbitrary File Deletion in WP User Frontend <= 4.3.11 versions.
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Analysis
by VulDB Data Team • 09/23/2026
The vulnerability identified as arbitrary file deletion within the WP User Frontend plugin, affecting versions up to and including 4.3.11, represents a critical security flaw that compromises the integrity of WordPress-based websites. This issue stems from insufficient input validation and authorization checks in specific administrative functions exposed through the plugin's frontend interface. The core technical deficiency lies in the application's failure to properly sanitize file path inputs provided by authenticated users with subscriber-level privileges or lower. When these users interact with certain profile editing features, they can manipulate parameters that dictate which files are processed for deletion. Because the underlying code does not adequately verify whether the targeted file resides within an allowed directory structure or belongs to a resource owned by the requesting user, it becomes possible to traverse directories and target system-critical files outside of the intended scope. This lack of restrictive path validation allows attackers to bypass standard security boundaries that are typically enforced in more robust implementations.
From a technical perspective, this vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory, often referred to as directory traversal. The exploitation mechanism relies on the ability to inject relative or absolute path sequences into input fields associated with avatar uploads or profile image management features. By carefully constructing these paths, an attacker can reference files located in sensitive areas such as configuration directories, backup folders, or even core WordPress installation files. Once the malicious request is processed by the server-side script responsible for handling file deletions, the operating system executes the removal command without verifying the legitimacy of the target location relative to the user's permissions. This behavior effectively grants low-privileged users administrative-level control over the filesystem, which contradicts the principle of least privilege fundamental to secure software architecture.
The operational impact of this vulnerability is severe and multifaceted. An attacker who successfully exploits this flaw can delete essential configuration files such as wp-config.php, leading to a complete denial of service for the web application due to the loss of database connection parameters and security salts. Furthermore, the deletion of theme or plugin files can disrupt site functionality entirely, requiring manual restoration from backups if available. Beyond immediate disruption, an attacker might use this capability to remove audit logs or security monitoring scripts, thereby obscuring their presence on the system. In more complex attack chains, deleting specific cache files could trigger unintended side effects in caching mechanisms, potentially leading to further instability. The ability to arbitrarily delete files also poses a significant risk to data integrity, as critical user-generated content or uploaded media can be permanently erased without authorization from site administrators.
This vulnerability aligns with the MITRE ATT&CK framework's technique of Impact via File Deletion, specifically falling under the sub-technique that involves destroying system resources. It highlights a common weakness in web applications where file management operations are exposed to end-users without rigorous server-side validation. The flaw underscores the importance of implementing strict allow-listing for directory access and ensuring that all file manipulation functions verify both ownership and location before execution. Security researchers emphasize that such vulnerabilities often arise from assumptions about user intent or insufficient testing of edge cases involving path traversal sequences like dot-dot-slash combinations.
To mitigate this vulnerability, site administrators should immediately update the WP User Frontend plugin to version 4.3.12 or later, where these input validation checks have been strengthened and authorization logic has been corrected. For sites that cannot be updated instantly due to compatibility concerns with other plugins, temporary workarounds include disabling specific frontend profile editing features if they are not essential for the site's operation. Additionally, implementing a Web Application Firewall can help detect and block requests containing suspicious path traversal patterns before they reach the application logic. Regular security audits focusing on file handling routines across all installed plugins are recommended to identify similar weaknesses in other components of the WordPress ecosystem. Maintaining regular backups is also crucial to ensure rapid recovery from any successful exploitation attempts, minimizing downtime and data loss associated with such destructive actions.