CVE-2025-53995 is a stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the Crocoblock JetPopup plugin up to version 2.0.15.1. This vulnerability arises due to improper neutralization of input during web page generation, allowing malicious actors to inject and store arbitrary scripts within the JetPopup plugin's data handling processes. When a victim accesses a page containing the compromised popup, the malicious script executes in their browser context. The vulnerability requires low privileges (PR:L) and user interaction (UI:R) to be exploited, but it can have a significant impact due to the scope of affected users and the persistent nature of stored XSS. The CVSS 3.1 base score is 6.5 (medium severity), reflecting network attack vector (AV:N), low attack complexity (AC:L), partial confidentiality, integrity, and availability impacts (C:L/I:L/A:L), and scope change (S:C). No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability primarily threatens the confidentiality and integrity of user data by enabling session hijacking, credential theft, or unauthorized actions performed in the context of the victim's session. Additionally, it can degrade availability by injecting disruptive scripts. The vulnerability is particularly relevant for websites using the JetPopup plugin, which is commonly employed in WordPress environments to create interactive popups for marketing, notifications, or user engagement.

For European organizations, this vulnerability poses a moderate risk, especially for those relying on WordPress sites with the Crocoblock JetPopup plugin installed. Exploitation could lead to unauthorized access to user sessions, data leakage, and potential defacement or disruption of web services. This is particularly concerning for organizations handling sensitive personal data under GDPR, as exploitation could result in data breaches and regulatory penalties. The stored XSS nature means that once an attacker injects malicious code, all visitors to the affected popup are at risk, amplifying the potential damage. E-commerce platforms, financial services, healthcare providers, and public sector websites using JetPopup are at higher risk due to the sensitivity of their data and the trust users place in their websites. Additionally, the scope change in the CVSS vector indicates that the vulnerability can affect components beyond the initially vulnerable module, potentially impacting broader system integrity and availability.

European organizations should immediately audit their WordPress installations to identify the presence and version of the Crocoblock JetPopup plugin. Until an official patch is released, the following specific mitigations are recommended: 1) Disable or remove the JetPopup plugin if it is not essential to reduce attack surface. 2) Implement Web Application Firewall (WAF) rules that detect and block typical XSS payloads targeting popup input fields or parameters. 3) Enforce strict Content Security Policy (CSP) headers to restrict script execution sources, mitigating the impact of injected scripts. 4) Conduct thorough input validation and output encoding on any user-generated content related to popups, if custom development is involved. 5) Monitor web server and application logs for unusual or suspicious input patterns indicative of exploitation attempts. 6) Educate site administrators about the risks of stored XSS and the importance of timely updates. Once a patch is available, prioritize its deployment and verify the fix through security testing. Additionally, consider implementing multi-factor authentication (MFA) for administrative access to reduce the risk of privilege escalation from compromised sessions.