CVE-2026-13231 in Advanced Content Feedback
Summary
by MITRE • 07/11/2026
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Advanced Content Feedback (aka admin_feedback) allows Stored XSS. This issue affects Advanced Content Feedback (aka admin_feedback) versions: from 0.0.0 to 2.8.0.
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Analysis
by VulDB Data Team • 07/11/2026
The vulnerability in question represents a critical cross-site scripting weakness within the Drupal Advanced Content Feedback module, specifically impacting versions ranging from 0.0.0 through 2.8.0. This flaw falls under the broader category of CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a fundamental web application security concern that enables attackers to inject malicious scripts into web pages viewed by other users. The vulnerability manifests as a stored cross-site scripting attack, meaning that malicious payloads are permanently stored on the server and executed whenever affected pages are accessed, rather than requiring immediate user interaction with a crafted link.
The technical implementation of this vulnerability stems from inadequate input sanitization within the module's content handling mechanisms. When administrators or users submit feedback through the advanced content feedback system, the application fails to properly escape or validate user-provided data before rendering it in web pages. This insufficient neutralization allows attackers to inject malicious javascript code or html elements that persist in the database and execute in the context of other users' browsers. The flaw is particularly dangerous because it operates at the web page generation level where user input directly influences the output delivered to end users, creating a persistent threat vector that can affect multiple visitors over time.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it creates a persistent backdoor for attackers to compromise user sessions and execute arbitrary commands within victim browsers. Attackers can leverage this stored xss vulnerability to steal authentication cookies, redirect users to malicious sites, modify page content, or even perform actions on behalf of authenticated users through session hijacking techniques. The vulnerability affects both administrative and regular user interfaces, potentially allowing unauthenticated attackers to escalate privileges or gain unauthorized access to sensitive systems. From an attack framework perspective, this vulnerability maps directly to the attack technique T1059.007 - Command and Scripting Interpreter: JavaScript within the MITRE ATT&CK framework, enabling adversaries to execute malicious code in user browsers.
Mitigation strategies for this vulnerability require immediate remediation through module version updates to versions that properly address the input sanitization issues. Organizations should implement comprehensive input validation and output encoding mechanisms, ensuring that all user-provided content passes through proper sanitization before being stored or rendered in web pages. Security headers including Content-Security-Policy should be implemented to restrict script execution and prevent unauthorized code injection. Regular security audits of third-party modules and dependency checks are essential to identify similar vulnerabilities in other components. Additionally, implementing web application firewalls with xss detection capabilities and conducting regular penetration testing can help identify potential exploitation vectors before they are leveraged by attackers. The vulnerability underscores the critical importance of maintaining up-to-date software versions and proper input validation practices as fundamental security measures for protecting web applications from persistent threats.