CVE-2025-5682 in Klaro Cookie & Consent Management
Summary
by MITRE • 06/26/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Drupal Klaro Cookie & Consent Management allows Cross-Site Scripting (XSS).This issue affects Klaro Cookie & Consent Management: from 0.0.0 before 3.0.7.
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Analysis
by VulDB Data Team • 06/26/2025
The vulnerability identified as CVE-2025-5682 represents a critical cross-site scripting weakness within the Drupal Klaro Cookie & Consent Management module, classified under CWE-79 Improper Neutralization of Input During Web Page Generation. This flaw enables malicious actors to inject arbitrary JavaScript code into web pages viewed by users, potentially compromising their sessions and data. The vulnerability specifically impacts versions of the Klaro module ranging from version 0.0.0 up to but not including 3.0.7, creating a substantial attack surface for systems utilizing this consent management solution.
The technical implementation of this XSS vulnerability stems from insufficient input validation and sanitization within the module's web page generation processes. When the Klaro module processes user-provided data for cookie consent management interfaces, it fails to properly escape or neutralize special characters that could be interpreted as executable script code. This improper handling occurs during the dynamic generation of web content, where user inputs are directly incorporated into HTML output without adequate security measures. Attackers can exploit this by crafting malicious payloads that, when processed by the vulnerable module, execute within the context of other users' browsers.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable sophisticated attack vectors including session hijacking, credential theft, and data exfiltration. An attacker who successfully exploits this XSS flaw could potentially impersonate legitimate users, access sensitive information, or manipulate the cookie consent interface to redirect users to malicious websites. The attack surface is particularly concerning given that Klaro is designed to manage cookie consent, making it a critical component in privacy compliance frameworks and user trust mechanisms. Systems utilizing this module may experience unauthorized access to user sessions, leading to potential data breaches and regulatory compliance violations.
Mitigation strategies for CVE-2025-5682 should prioritize immediate patching to versions 3.0.7 or later where the XSS vulnerability has been addressed. Organizations should also implement additional security measures including content security policy enforcement, input validation at multiple layers, and regular security assessments of web applications. The vulnerability aligns with ATT&CK technique T1531 Lateral Tool Transfer and T1203 Exploitation for Client Execution, demonstrating how XSS flaws can serve as initial access vectors for more complex attack chains. Security teams should conduct comprehensive vulnerability assessments to identify any custom implementations or modifications that may have introduced additional exposure, while also monitoring network traffic for potential exploitation attempts. The remediation process must include thorough testing of the patched version to ensure that the XSS mitigation does not introduce regressions in the cookie consent management functionality.