CVE-2024-29910 in Dropdown Multisite selector Plugin
Summary
by MITRE • 03/27/2024
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Alordiel Dropdown Multisite selector allows Stored XSS.This issue affects Dropdown Multisite selector: from n/a through 0.9.2.
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Analysis
by VulDB Data Team • 04/12/2025
The vulnerability identified as CVE-2024-29910 represents a critical cross-site scripting flaw within the Alordiel Dropdown Multisite selector plugin, specifically impacting versions ranging from the initial release through 0.9.2. This issue falls under the broader category of improper input neutralization during web page generation, creating a persistent security weakness that enables attackers to inject malicious scripts into web pages viewed by other users. The vulnerability manifests as a stored XSS attack vector, meaning that malicious code injected by an attacker can be permanently stored on the server and subsequently executed whenever affected pages are accessed by legitimate users. This type of vulnerability is particularly dangerous because it can remain dormant for extended periods while continuously exposing users to potential exploitation.
The technical flaw stems from inadequate sanitization and validation of user input within the plugin's web page generation process. When users interact with the dropdown multisite selector functionality, the application fails to properly escape or filter potentially malicious input before incorporating it into dynamically generated HTML content. This failure creates an opening for attackers to inject malicious JavaScript code through various input fields that the plugin processes, including but not limited to site names, URLs, or configuration parameters. The vulnerability is classified as a stored XSS (CWE-79) according to the Common Weakness Enumeration catalog, which specifically addresses the improper neutralization of input data that leads to script execution in web applications. The ATT&CK framework categorizes this as a code injection technique under the T1566.001 sub-technique, where adversaries leverage web application vulnerabilities to execute malicious code in the context of the victim's browser.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it can enable attackers to perform a wide range of malicious activities through the compromised user sessions. An attacker could potentially steal sensitive cookies, session tokens, or other authentication credentials that would allow them to impersonate legitimate users and gain unauthorized access to protected resources. The stored nature of the vulnerability means that once an attacker successfully injects malicious code, the payload will persist and execute automatically for all users who view the affected pages, creating a continuous threat vector that can affect numerous users simultaneously. This vulnerability particularly impacts WordPress environments where the plugin is installed, potentially compromising entire multisite networks if the plugin is widely deployed across multiple sites within the same network.
Mitigation strategies for CVE-2024-29910 should prioritize immediate remediation through the application of security patches provided by the vendor or by upgrading to a version that addresses the identified XSS vulnerability. Organizations should implement comprehensive input validation and output encoding mechanisms to prevent malicious code injection, ensuring that all user-supplied data is properly sanitized before being processed or displayed in web pages. Network administrators should also consider implementing web application firewalls that can detect and block known XSS attack patterns, while security monitoring systems should be configured to identify suspicious activities related to the plugin's functionality. Additionally, implementing content security policies and regular security audits of web applications can help prevent similar vulnerabilities from emerging in other components of the system. The vulnerability highlights the critical importance of maintaining up-to-date software versions and implementing robust security practices throughout the application development lifecycle, as outlined in various cybersecurity frameworks including the NIST Cybersecurity Framework and ISO/IEC 27001 standards.