CVE-2025-63005 is a stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, found in the Tomas WordPress Tooltips plugin, affecting all versions up to 10.7.9. The vulnerability stems from improper neutralization of input during web page generation, which allows an attacker to inject malicious JavaScript code that is stored persistently within the plugin's data. When other users view the affected pages, the malicious script executes in their browsers, potentially leading to session hijacking, credential theft, defacement, or further exploitation of the victim's browser environment. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) indicates that the attack can be performed remotely over the network with low attack complexity, requires low privileges (authenticated user), and user interaction (victim must visit the malicious page). The scope is changed, meaning the vulnerability affects components beyond the initially vulnerable component, impacting confidentiality, integrity, and availability to a limited extent. No patches or known exploits are currently available, but the vulnerability is publicly disclosed and should be addressed promptly. The plugin is widely used in WordPress environments to enhance user experience by providing tooltip information, making it a valuable target for attackers aiming to compromise websites or their visitors.

For European organizations, this vulnerability poses a moderate risk primarily to websites using the Tomas WordPress Tooltips plugin. Exploitation could lead to unauthorized access to user sessions, theft of sensitive information, or the spread of malware through injected scripts. This can damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR breaches if personal data is compromised), and cause operational disruptions. Public-facing websites, especially those handling user authentication or sensitive transactions, are at higher risk. The stored nature of the XSS means multiple users can be affected once the malicious payload is injected, amplifying the potential impact. Additionally, attackers could leverage this vulnerability as a foothold for further attacks within the network or to pivot to other systems. Given the medium severity and the requirement for user interaction, the impact is significant but not critical, emphasizing the need for timely mitigation.

1. Monitor for plugin updates from the vendor and apply patches immediately once available. 2. Until a patch is released, consider disabling or removing the Tomas WordPress Tooltips plugin if feasible. 3. Implement strict input validation and output encoding on all user-supplied data within the plugin context to prevent malicious script injection. 4. Deploy a Web Application Firewall (WAF) configured to detect and block common XSS attack patterns targeting WordPress plugins. 5. Conduct regular security audits and penetration testing focusing on third-party plugins and their input handling. 6. Educate site administrators and users about the risks of clicking on untrusted links or interacting with suspicious content. 7. Restrict plugin access to trusted users only and enforce the principle of least privilege to limit exploitation potential. 8. Monitor logs for unusual activity that might indicate exploitation attempts or successful attacks. 9. Consider implementing Content Security Policy (CSP) headers to reduce the impact of potential XSS payloads. 10. Maintain regular backups of website data to enable quick recovery in case of compromise.