CVE-2025-7715 is a Cross-Site Scripting (XSS) vulnerability identified in the Drupal Block Attributes module, specifically affecting versions prior to 1.1.0 in the 0.x series and versions before 2.0.1 in the 2.x series. The vulnerability arises from improper neutralization of input during web page generation, classified under CWE-79. This means that user-supplied input is not adequately sanitized or escaped before being included in the HTML output, allowing an attacker to inject malicious scripts. When a victim visits a compromised page, these scripts can execute in their browser context, potentially leading to session hijacking, defacement, or redirection to malicious sites. The CVSS v3.1 base score is 6.1, indicating a medium severity level. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) shows that the attack can be performed remotely over the network without privileges, requires low attack complexity, no privileges, but does require user interaction (e.g., clicking a link). The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable component. The impact on confidentiality and integrity is low, with no impact on availability. No known exploits are currently reported in the wild, and no official patches or mitigation links are provided in the data, suggesting that the vulnerability is recent and may require immediate attention from administrators. Drupal is a widely used content management system (CMS), and the Block Attributes module is commonly used to customize block elements on Drupal sites, making this vulnerability relevant for many web applications relying on Drupal for content delivery.

For European organizations, this vulnerability poses a moderate risk primarily to web-facing applications built on Drupal that utilize the Block Attributes module. Exploitation could lead to theft of user credentials, session tokens, or other sensitive information through malicious script execution in users' browsers. This can result in unauthorized access, data leakage, or reputational damage. Given the widespread adoption of Drupal across public sector websites, educational institutions, and private enterprises in Europe, the potential for targeted phishing or social engineering attacks leveraging this vulnerability is significant. Moreover, the changed scope (S:C) indicates that the vulnerability could affect multiple components or user roles, potentially broadening the attack surface. Although no availability impact is noted, the integrity and confidentiality impacts, even if low, can be critical in environments handling personal data under GDPR regulations. Failure to address this vulnerability could lead to compliance issues and financial penalties. The requirement for user interaction means that social engineering or tricking users into clicking malicious links is necessary, which may limit automated exploitation but does not eliminate risk.

Organizations should promptly identify all Drupal installations using the Block Attributes module and verify the version in use. Immediate mitigation steps include upgrading the module to version 1.1.0 or later for the 0.x series and 2.0.1 or later for the 2.x series once patches are available. In the absence of official patches, administrators should implement strict input validation and output encoding on all user-supplied data rendered in block attributes. Employing Content Security Policy (CSP) headers can help mitigate the impact of injected scripts by restricting script execution sources. Additionally, web application firewalls (WAFs) should be configured to detect and block typical XSS payloads targeting Drupal block attributes. Regular security audits and penetration testing focused on XSS vulnerabilities should be conducted. User awareness training to recognize phishing attempts and suspicious links can reduce the risk posed by the required user interaction. Monitoring web server logs for unusual requests or error patterns related to block attributes can provide early detection of exploitation attempts. Finally, organizations should maintain an incident response plan tailored to web application attacks to quickly contain and remediate any successful exploitation.