CVE-2026-4314 in The Ultimate WordPress Toolkit Plugin
Summary
by MITRE • 03/22/2026
The 'The Ultimate WordPress Toolkit – WP Extended' plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.2.4. This is due to the `isDashboardOrProfileRequest()` method in the Menu Editor module using an insecure `strpos()` check against `$_SERVER['REQUEST_URI']` to determine if a request targets the dashboard or profile page. The `grantVirtualCaps()` method, which is hooked into the `user_has_cap` filter, grants elevated capabilities including `manage_options` when this check returns true. This makes it possible for authenticated attackers, with Subscriber-level access and above, to gain administrative capabilities by appending a crafted query parameter to any admin URL, allowing them to update arbitrary WordPress options and ultimately create new Administrator accounts.
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Analysis
by VulDB Data Team • 03/22/2026
The vulnerability identified as CVE-2026-4314 affects the 'The Ultimate WordPress Toolkit – WP Extended' plugin, specifically targeting versions up to and including 3.2.4. This represents a critical privilege escalation flaw that undermines the security model of WordPress installations. The vulnerability stems from improper access control implementation within the plugin's Menu Editor module, where the system fails to properly validate administrative requests. The flaw allows authenticated users with subscriber-level permissions or higher to escalate their privileges through a carefully crafted request manipulation technique.
The technical implementation of this vulnerability resides in the insecure `strpos()` function call within the `isDashboardOrProfileRequest()` method. This method performs a simple string search operation against the `$_SERVER['REQUEST_URI']` variable to determine if the current request is targeting a dashboard or profile page. The insecure approach allows attackers to bypass legitimate access controls by appending malicious query parameters that pass the flawed string matching logic. This particular implementation pattern aligns with CWE-20: Improper Input Validation, where insufficient validation of input data leads to security vulnerabilities. The vulnerability demonstrates poor defensive programming practices where a simple string containment check fails to properly validate the request context.
The operational impact of this privilege escalation vulnerability is severe and far-reaching for affected WordPress installations. An authenticated attacker with subscriber-level access can exploit this flaw to gain administrative capabilities including `manage_options` permission, which provides complete control over WordPress configuration settings. This elevated access allows the attacker to modify arbitrary WordPress options, potentially compromising the entire site's security posture. The vulnerability creates a pathway for attackers to establish persistent administrative access through account creation, making it particularly dangerous for sites with multiple user roles. The ability to manipulate core WordPress settings through this vulnerability can lead to complete site compromise and data exfiltration.
The exploitation mechanism leverages the hook into the `user_has_cap` filter, which is a WordPress core mechanism for managing user capabilities. When the flawed `isDashboardOrProfileRequest()` method incorrectly identifies a request as targeting administrative pages, the `grantVirtualCaps()` method grants elevated privileges. This approach violates the principle of least privilege and demonstrates a failure in proper capability management. From an ATT&CK framework perspective, this vulnerability maps to T1078: Valid Accounts and T1548.001: Abuse Elevation of Privilege, as it allows attackers to leverage existing user accounts to gain higher privileges. The vulnerability also relates to T1059: Command and Scripting Interpreter, as the elevated privileges enable attackers to execute arbitrary code through WordPress administrative interfaces.
Mitigation strategies for this vulnerability require immediate action from site administrators. The most effective immediate solution is to update the affected plugin to a version that addresses the privilege escalation flaw. Until such updates are available, administrators should consider implementing additional security measures including restricting access to administrative interfaces through IP whitelisting, implementing strong authentication controls, and monitoring for suspicious administrative activity. The vulnerability highlights the importance of proper input validation and access control implementation in WordPress plugins, emphasizing the need for comprehensive security testing of third-party software components. Additionally, implementing web application firewalls and security monitoring solutions can help detect and prevent exploitation attempts. Regular security audits of installed plugins and themes remain essential for maintaining WordPress security posture, as this vulnerability demonstrates how seemingly minor implementation flaws can create significant security risks.