CVE-2025-62920 identifies a stored cross-site scripting (XSS) vulnerability in the webnique USERCENTRICS Consent Management Platform (CMP) affecting versions up to and including 1.0.9. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, allowing malicious scripts to be stored persistently within the platform. When legitimate users access affected pages, the embedded malicious scripts execute in their browsers under the domain of the CMP, bypassing same-origin policies. This can lead to a range of attacks including session hijacking, theft of sensitive data such as cookies or authentication tokens, and unauthorized actions performed on behalf of users. The CMP is widely used to manage user consent for cookies and data processing, especially in compliance with GDPR and other privacy regulations. Although no public exploits have been reported yet, the nature of stored XSS vulnerabilities makes them particularly dangerous as they do not require user interaction beyond visiting a compromised page and can affect multiple users. The lack of a CVSS score indicates this is a newly disclosed vulnerability, but the technical details and impact potential warrant urgent attention. The vulnerability affects all versions up to 1.0.9, with no patches currently linked, emphasizing the need for vendor response and interim mitigations.

For European organizations, the impact of this vulnerability is significant due to the widespread use of USERCENTRICS CMP in managing GDPR consent mechanisms. Exploitation could lead to unauthorized access to user sessions, leakage of personal data, and manipulation of consent records, undermining compliance efforts and potentially resulting in regulatory penalties. The stored XSS nature means attackers can embed malicious scripts that affect multiple users over time, increasing the scale of impact. This can erode user trust and damage organizational reputation. Additionally, attackers could leverage the vulnerability to pivot into internal networks or escalate privileges if the CMP interfaces with other systems. Given the critical role of consent management in data privacy, any compromise can have cascading effects on data integrity and confidentiality. The absence of known exploits currently provides a window for mitigation, but the risk remains high due to the ease of exploitation and the sensitive nature of the data involved.

1. Monitor vendor communications closely for official patches addressing CVE-2025-62920 and apply them promptly upon release. 2. Implement strict input validation and output encoding on all user inputs processed by the CMP to neutralize malicious scripts. 3. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts within the CMP domain. 4. Conduct thorough code reviews and penetration testing focused on input handling and XSS vectors within the CMP environment. 5. Isolate the CMP deployment in a segmented network zone to limit potential lateral movement in case of compromise. 6. Educate administrators and users about the risks of XSS and encourage vigilance regarding suspicious behavior or unexpected consent prompts. 7. Utilize web application firewalls (WAFs) with updated signatures to detect and block XSS attack attempts targeting the CMP. 8. Regularly audit consent records and logs for anomalies that may indicate exploitation attempts or successful attacks.