CVE-2024-9221 in Tainacan Plugin
Summary
by MITRE • 10/11/2024
The Tainacan plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 0.21.10. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 03/07/2025
The vulnerability identified as CVE-2024-9221 affects the Tainacan plugin for WordPress, a widely used digital repository and collection management system that enables institutions to create and manage online collections of digital assets. This plugin serves as a critical component for academic libraries, museums, and cultural heritage organizations that rely on WordPress platforms to host their digital collections. The vulnerability manifests as a reflected cross-site scripting flaw that has been present in all versions up to and including 0.21.10, representing a significant security risk for organizations that depend on this plugin for their digital infrastructure. The flaw specifically resides in how the plugin handles URL parameters through the add_query_arg function without proper sanitization or escaping mechanisms.
The technical implementation of this vulnerability stems from improper handling of user-supplied input within the plugin's URL construction logic. When the add_query_arg function is used without appropriate escaping, it fails to sanitize the input parameters that are subsequently included in the URL. This creates an environment where malicious actors can inject arbitrary JavaScript code into URL parameters that are then reflected back to users who visit the affected pages. The vulnerability is classified as a reflected XSS attack because the malicious script is not stored on the server but is instead injected into the URL and executed when a user clicks on a malicious link or visits a compromised page. This type of attack pattern aligns with CWE-79, which specifically addresses cross-site scripting vulnerabilities where untrusted data is reflected back to users without proper sanitization.
The operational impact of this vulnerability extends beyond simple script injection, as it creates a vector for more sophisticated attacks that can compromise user sessions, steal sensitive information, or redirect users to malicious websites. Unauthenticated attackers can exploit this vulnerability by crafting malicious URLs that contain JavaScript payloads, which will execute in the context of the victim's browser when they click on the link. This makes the attack particularly dangerous because it requires no authentication from the attacker and can be delivered through various channels including phishing emails, compromised websites, or social media platforms. The reflected nature of the attack means that the malicious code is executed immediately upon page load, making it difficult for users to detect or prevent the execution of the injected scripts. This vulnerability directly impacts the principle of least privilege and can potentially lead to privilege escalation or data exfiltration if users with administrative privileges click on malicious links.
Organizations using the Tainacan plugin should implement immediate mitigations to address this vulnerability, including updating to the latest version of the plugin where the XSS flaw has been patched. The recommended approach involves upgrading to version 0.21.11 or later, which contains the necessary security fixes to properly escape URL parameters and prevent malicious script injection. Additionally, administrators should implement input validation and output escaping mechanisms at the WordPress level to provide defense-in-depth protection against similar vulnerabilities. Security measures should include monitoring for suspicious URL patterns, implementing content security policies to limit script execution, and educating users about the risks of clicking on untrusted links. The vulnerability demonstrates the importance of proper input sanitization and output escaping as outlined in the OWASP Top Ten security principles, and represents a clear example of how insufficient data validation can lead to severe security consequences. Organizations should also consider implementing web application firewalls to detect and block malicious URL patterns, as well as regular security audits to identify and remediate similar vulnerabilities across their WordPress installations. The ATT&CK framework categorizes this type of vulnerability under T1213 - Data from Information Repositories, highlighting how such flaws can be exploited to compromise repository systems and potentially gain access to sensitive digital assets managed by the vulnerable plugin.