CVE-2025-48915 is a Cross-Site Scripting (XSS) vulnerability classified under CWE-79, affecting the Drupal COOKiES Consent Management module versions prior to 1.2.15 (specifically from 0.0.0 before 1.2.15). This vulnerability arises due to 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 session. The flaw is rooted in insufficient sanitization or encoding of user-supplied input that is reflected back in the web page output, enabling attackers to craft payloads that can hijack user sessions, steal cookies, deface websites, or perform actions on behalf of authenticated users. The vulnerability does not require authentication or user interaction beyond visiting a crafted URL or interacting with a compromised page. No known exploits are currently reported in the wild, and no CVSS score has been assigned yet. The vulnerability was publicly disclosed on June 13, 2025, with the Drupal project responsible for the affected module. The absence of a patch link suggests that a fix may be pending or recently released but not yet widely documented. Given Drupal's widespread use in European organizations for content management and compliance with cookie consent regulations, this vulnerability poses a significant risk if left unmitigated.

For European organizations, the impact of this XSS vulnerability can be substantial. Many European entities rely on Drupal-based websites to manage user consent for cookies, especially under stringent regulations like the GDPR. Exploitation could lead to unauthorized access to sensitive user data, session hijacking, and manipulation of consent preferences, undermining both user privacy and regulatory compliance. This could result in reputational damage, legal penalties, and loss of customer trust. Additionally, attackers could leverage this vulnerability as a foothold to deliver further attacks such as phishing or malware distribution. The vulnerability's presence in a consent management module is particularly critical because it directly interacts with user privacy controls, increasing the risk of data leakage or manipulation. Given the lack of authentication requirements, attackers can exploit this vulnerability remotely and at scale, potentially affecting a large number of users and systems across Europe.

1. Immediate upgrade to Drupal COOKiES Consent Management version 1.2.15 or later once available, as this will contain the official patch addressing the input sanitization flaw. 2. In the interim, implement strict Content Security Policy (CSP) headers to restrict script execution and mitigate the impact of injected scripts. 3. Employ web application firewalls (WAFs) with custom rules to detect and block typical XSS payloads targeting the consent management module. 4. Conduct thorough input validation and output encoding on all user-supplied data related to cookie consent interfaces, ensuring that any dynamic content is properly escaped. 5. Monitor web server and application logs for unusual request patterns indicative of XSS exploitation attempts. 6. Educate web administrators and developers on secure coding practices specific to input handling in consent management contexts. 7. Regularly audit and test the consent management module using automated scanning tools and manual penetration testing to detect residual or new vulnerabilities. 8. Consider temporarily disabling or restricting access to the vulnerable module if patching is delayed and risk is deemed high.