CVE-2026-91832 in WP Mobile Menu Plugin
Summary
by MITRE • 09/30/2026
The WP Mobile Menu WordPress plugin before 2.9 does not correctly verify the nonce on its settings import, so an attacker can import arbitrary WP Mobile Menu WordPress plugin before 2.9 settings through a cross-site request in an administrator's session, and the imported values are then output unescaped to every visitor, resulting in Stored Cross-Site Scripting.
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Analysis
by VulDB Data Team • 09/30/2026
The vulnerability identified in versions of the WP Mobile Menu WordPress plugin prior to version 2.9 stems from a critical failure in input validation and security control implementation during the settings import process. Specifically, the application does not correctly verify the nonce value associated with administrative actions. In modern web applications, particularly those built on frameworks like WordPress, nonces are essential cryptographic tokens used to prevent Cross-Site Request Forgery attacks by ensuring that requests originate from legitimate user interactions within an authenticated session rather than being forged by external malicious actors. The absence of this verification allows any actor who can trick a logged-in administrator into visiting a crafted URL or clicking a manipulated link to execute arbitrary administrative functions without the administrator's explicit consent or knowledge.
This flaw directly facilitates Cross-Site Request Forgery, which is categorized under CWE-352 in the Common Weakness Enumeration standard. By exploiting this weakness, an attacker can inject malicious configuration data into the plugin’s settings database through a forged request that appears to come from the authenticated administrator. The operational impact of this vulnerability extends beyond mere unauthorized configuration changes because the imported values are subsequently rendered on public-facing pages without proper output escaping or sanitization. This lack of secure output handling creates a Stored Cross-Site Scripting vector, classified as CWE-79 in industry standards. Unlike reflected XSS where malicious scripts execute only for specific users who click a link, stored XSS persists within the application's database and is served to every visitor accessing the affected pages, significantly amplifying the potential damage.
The exploitation of this vulnerability allows an attacker to achieve persistent arbitrary code execution on behalf of any user visiting the compromised website. This can lead to severe consequences such as session hijacking, where attackers steal administrator cookies to gain full control over the WordPress dashboard; defacement of the website content; or redirection of users to malicious phishing sites designed to harvest credentials and sensitive information. From a threat intelligence perspective, this attack pattern aligns with MITRE ATT&CK techniques related to Web Application Attack vectors, specifically those involving client-side code injection and session manipulation. The persistence of the script in stored settings means that even if the initial administrative account is secured later, all subsequent visitors remain at risk until the malicious configuration is manually removed from the database.
Mitigation for this vulnerability requires immediate action by website administrators to upgrade the WP Mobile Menu plugin to version 2.9 or any later release where these security controls have been properly implemented. Developers must ensure that all administrative actions involving state-changing operations, such as importing settings, enforce strict nonce verification using functions like check_admin_referer in WordPress environments. Furthermore, it is imperative to implement robust output encoding for all data rendered on public-facing pages to neutralize any potentially malicious content stored in the database. Security best practices dictate adopting a defense-in-depth strategy that includes both input validation at the point of entry and strict output sanitization at the point of display to prevent similar classes of vulnerabilities from being exploited in future updates or other plugins within the same ecosystem.