CVE-2025-64198 identifies a reflected Cross-site Scripting (XSS) vulnerability in the Easy Social Share Buttons plugin developed by appscreo, affecting all versions prior to 10.7.1. This vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious JavaScript code that is reflected back to users without adequate sanitization. When a victim interacts with a crafted URL or input, the malicious script executes in their browser context, potentially leading to session hijacking, theft of cookies or credentials, unauthorized actions on behalf of the user, or defacement of the website. The CVSS v3.1 base score of 7.1 reflects a high severity, with an attack vector of network (remote), low attack complexity, no privileges required, but user interaction necessary. The scope is changed, indicating that the vulnerability affects components beyond the initially vulnerable plugin, potentially impacting the broader web application environment. Although no known exploits are currently in the wild, the popularity of Easy Social Share Buttons as a WordPress plugin means many websites could be vulnerable, especially those that do not regularly update their plugins. The vulnerability's impact spans confidentiality, integrity, and availability, as attackers can leverage XSS to compromise user sessions, inject malicious content, or disrupt normal website operations. The lack of official patch links in the provided data suggests defenders should monitor vendor channels closely for updates. Overall, this vulnerability represents a significant risk to websites using the affected plugin versions, necessitating prompt remediation and enhanced input handling practices.

For European organizations, the impact of CVE-2025-64198 can be substantial, particularly for those relying on WordPress websites with the Easy Social Share Buttons plugin installed. Successful exploitation can lead to unauthorized access to user accounts through session hijacking, exposure of sensitive user data, and potential defacement or disruption of web services. This can damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR breaches due to data exposure), and result in financial losses from downtime or remediation costs. E-commerce platforms, government portals, and service providers are especially vulnerable due to their reliance on web interfaces for customer interaction. The reflected XSS nature means phishing campaigns can be enhanced by embedding malicious scripts in URLs, increasing the risk of social engineering attacks targeting European users. Additionally, the changed scope indicates that the vulnerability might affect integrated systems or third-party components, broadening the potential attack surface. Given Europe's stringent data protection laws and the high value placed on privacy and security, exploitation of this vulnerability could trigger significant legal and financial consequences for affected organizations.

To mitigate CVE-2025-64198 effectively, European organizations should immediately update the Easy Social Share Buttons plugin to version 10.7.1 or later once available, as this is the primary remediation step. In parallel, implement strict input validation and output encoding on all user-supplied data to prevent injection of malicious scripts. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. Conduct thorough security audits of all web-facing components, especially those integrating third-party plugins, to identify and remediate similar input handling issues. Educate users and administrators about the risks of clicking on suspicious links and encourage the use of browser security features that can detect and block XSS attempts. Additionally, consider deploying Web Application Firewalls (WAFs) with rules tailored to detect and block reflected XSS payloads targeting the affected plugin. Maintain an active vulnerability management program to monitor for updates and emerging exploits related to this vulnerability. Finally, review and enhance incident response plans to quickly address any exploitation attempts.