CVE-2025-5682 is a Cross-Site Scripting (XSS) vulnerability classified under CWE-79, affecting the Klaro Cookie & Consent Management module used within the Drupal ecosystem. This vulnerability arises from improper neutralization of input during web page generation, allowing malicious actors to inject and execute arbitrary scripts in the context of a user's browser. The affected versions include all releases from 0.0.0 up to but not including version 3.0.7, indicating that the vulnerability was present in early versions of the Klaro Cookie & Consent Management module prior to the 3.0.7 update. XSS vulnerabilities like this typically occur when user-supplied data is not properly sanitized or encoded before being included in web pages, enabling attackers to manipulate client-side scripts. Exploitation of this vulnerability could allow attackers to steal session cookies, perform actions on behalf of authenticated users, or redirect users to malicious sites. Although no known exploits are currently reported in the wild, the vulnerability is publicly disclosed and patched in version 3.0.7, emphasizing the importance of timely updates. The absence of a CVSS score suggests that the vulnerability is newly published and has not yet undergone formal severity assessment, but the nature of XSS vulnerabilities inherently carries significant risk, especially in web applications handling sensitive user data or authentication.

For European organizations, the impact of CVE-2025-5682 can be substantial, particularly for those relying on Drupal-based websites that utilize the Klaro Cookie & Consent Management module for GDPR-compliant cookie consent management. Given the strict data protection regulations under GDPR, exploitation of this XSS vulnerability could lead to unauthorized access to personal data, session hijacking, and potential data breaches, resulting in regulatory penalties and reputational damage. Additionally, since cookie consent modules are integral to user privacy controls, compromising them undermines user trust and compliance efforts. Attackers could leverage this vulnerability to execute malicious scripts that capture user input or credentials, perform phishing attacks, or propagate malware. The impact extends beyond confidentiality to integrity and availability if attackers manipulate site content or disrupt normal operations. Organizations with high web traffic or those serving sensitive sectors such as finance, healthcare, or government are at elevated risk due to the potential scale and sensitivity of compromised data.

To mitigate this vulnerability, European organizations should immediately upgrade the Klaro Cookie & Consent Management module to version 3.0.7 or later, where the issue is resolved. In addition to patching, organizations should implement strict Content Security Policies (CSP) to restrict the execution of unauthorized scripts and reduce the risk of XSS exploitation. Input validation and output encoding should be enforced rigorously across all web application components, especially those handling user-generated content or third-party inputs. Regular security audits and penetration testing focused on client-side vulnerabilities can help identify residual risks. Web Application Firewalls (WAFs) configured to detect and block XSS payloads provide an additional layer of defense. Monitoring web logs for unusual activity and user reports of suspicious behavior can aid in early detection of exploitation attempts. Finally, educating developers and administrators about secure coding practices and timely patch management is critical to prevent similar vulnerabilities.