CVE-2025-24547 in Caching Compatible Cookie Opt-In and JavaScript Plugin
Summary
by MITRE • 01/24/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Matthias Wagner - FALKEmedia Caching Compatible Cookie Opt-In and JavaScript allows Stored XSS. This issue affects Caching Compatible Cookie Opt-In and JavaScript: from n/a through 0.0.10.
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Analysis
by VulDB Data Team • 02/09/2025
This vulnerability represents a critical cross-site scripting flaw in the FALKEmedia Caching Compatible Cookie Opt-In and JavaScript plugin developed by Matthias Wagner. The issue manifests as improper neutralization of input during web page generation, creating an environment where malicious scripts can be persistently stored and executed within the victim's browser context. The vulnerability specifically impacts versions ranging from the initial release through version 0.0.10, indicating a widespread exposure across the plugin's release history. The stored nature of this XSS vulnerability means that malicious input submitted by an attacker is not properly sanitized or escaped before being rendered back to users, allowing persistent script execution.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding mechanisms within the plugin's cookie consent handling functionality. When users interact with the cookie opt-in interface or when the plugin processes user-submitted data, the system fails to properly sanitize potentially malicious input before incorporating it into dynamically generated web pages. This allows attackers to inject malicious JavaScript payloads that are then stored within the application's data storage and executed whenever affected pages are rendered for legitimate users. The flaw operates at the web application level and specifically targets the plugin's handling of user interactions and cookie consent management features.
The operational impact of this vulnerability is significant as it provides attackers with persistent access to users' browser sessions, potentially enabling session hijacking, credential theft, or data exfiltration. Attackers can craft malicious payloads that execute in the context of authenticated users, potentially compromising sensitive information or performing unauthorized actions within the application. The stored nature of the XSS means that the attack vector can persist long after the initial injection, making detection and remediation more challenging. This vulnerability particularly affects websites using the FALKEmedia plugin for cookie consent management, potentially exposing thousands of sites to persistent scripting attacks.
Mitigation strategies should focus on immediate input sanitization and output encoding implementation to prevent malicious script injection. The plugin developers should implement comprehensive input validation that strips or escapes potentially dangerous characters and sequences before processing user data. Additionally, proper output encoding should be applied when rendering user-submitted content within web pages to prevent script execution. Organizations should also consider implementing content security policies to limit script execution and monitor for suspicious input patterns. This vulnerability aligns with CWE-79 - Improper Neutralization of Input During Web Page Generation and follows ATT&CK technique T1531 - Account Access Removal and T1566 - Phishing to establish initial access for persistent XSS exploitation. Regular security updates and input validation audits should be implemented to prevent similar vulnerabilities in future releases.