CVE-2025-58607 is a stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the GDPR Info Cookie Notice & Consent Banner for GDPR & CCPA Compliance plugin, versions up to 1.7.11. This vulnerability arises due to improper neutralization of input during web page generation, allowing malicious scripts to be injected and stored within the application. When a user accesses a page displaying the compromised cookie notice or consent banner, the malicious script executes in the context of the user's browser. The CVSS 3.1 base score of 6.5 reflects a medium severity, with an attack vector of network (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), and user interaction (UI:R). The scope is changed (S:C), indicating that the vulnerability affects components beyond the initially vulnerable component. The impact affects confidentiality, integrity, and availability at a low level, as the attacker can execute arbitrary scripts that may steal session tokens, manipulate page content, or perform actions on behalf of the user. Exploitation requires an attacker with some level of privileges on the system to inject the malicious payload, and the victim must interact with the affected page to trigger the payload. No known exploits are reported in the wild yet, and no patches are currently linked, suggesting that remediation may still be pending or in development. The vulnerability specifically targets a plugin widely used to ensure compliance with GDPR and CCPA regulations, which is commonly deployed on websites to manage cookie consent banners. Stored XSS vulnerabilities are particularly dangerous because they persist on the server and affect all users who view the compromised content, potentially enabling widespread exploitation.

For European organizations, this vulnerability poses a significant risk due to the widespread use of GDPR compliance tools like the affected plugin. Exploitation could lead to unauthorized access to user session data, theft of personal information, or manipulation of consent data, which could further violate GDPR requirements and result in regulatory penalties. The stored XSS could also be leveraged to conduct phishing attacks or deliver malware to site visitors, undermining user trust and damaging brand reputation. Since the vulnerability affects cookie consent banners, which are visible to all visitors, the attack surface is broad, potentially impacting a large number of users. Additionally, any compromise of consent data integrity could have legal implications under GDPR, as organizations are required to maintain accurate records of user consent. The medium severity rating suggests that while the vulnerability is not trivial, it requires some privileges and user interaction, somewhat limiting immediate exploitation but still demanding prompt attention. The lack of known exploits in the wild provides a window for proactive mitigation before attackers develop weaponized payloads.

Organizations should immediately audit their use of the GDPR Info Cookie Notice & Consent Banner plugin and verify the version in use. Upgrading to a patched version, once available, is the most effective mitigation. In the interim, applying web application firewall (WAF) rules to detect and block suspicious input patterns targeting the consent banner can reduce risk. Implementing Content Security Policy (CSP) headers that restrict script execution sources can mitigate the impact of XSS payloads. Conduct thorough input validation and output encoding on all user-supplied data rendered in the consent banner to prevent injection. Regularly scan web applications for XSS vulnerabilities using automated tools and manual testing, focusing on components handling user input. Educate developers and administrators about secure coding practices specific to web content generation and the risks of stored XSS. Monitor logs for unusual activity related to the consent banner and user interactions that could indicate exploitation attempts. Finally, prepare incident response plans that include steps for containment and remediation of XSS incidents, especially in the context of GDPR compliance tools.