CVE-2025-47449 is a Stored Cross-Site Scripting (XSS) vulnerability classified under CWE-79, affecting the Jordy Meow Meow Gallery plugin, specifically versions up to 5.2.7. Stored XSS occurs when malicious input is improperly neutralized and then stored by the application, later rendered in web pages without adequate sanitization or encoding. This allows an attacker to inject malicious scripts that execute in the browsers of users who view the affected pages. The vulnerability arises from improper input validation during web page generation, enabling attackers with at least some level of privileges (as indicated by the CVSS vector requiring privileges and user interaction) to inject scripts that can compromise confidentiality, integrity, and availability of user sessions and data. The CVSS 3.1 score of 5.9 (medium severity) reflects that exploitation requires network access, low attack complexity, privileges, and user interaction, but can lead to partial loss of confidentiality, integrity, and availability. The vulnerability has not yet been reported as exploited in the wild, and no patches are currently linked, indicating that mitigation may rely on vendor updates or user-side controls. Stored XSS can be leveraged for session hijacking, defacement, phishing, or delivering further malware, posing significant risks especially in environments where the plugin is widely used and trusted by users.

For European organizations, the impact of this vulnerability can be significant, particularly for those using the Meow Gallery plugin on websites or intranet portals. Stored XSS can lead to unauthorized access to user credentials, session tokens, or sensitive data, undermining user trust and potentially violating GDPR requirements regarding data protection and breach notification. The ability to execute arbitrary scripts in users' browsers can facilitate phishing attacks, malware distribution, or unauthorized actions on behalf of users, affecting both customer-facing and internal applications. This can result in reputational damage, legal liabilities, and operational disruptions. Organizations in sectors with high regulatory scrutiny, such as finance, healthcare, and public administration, may face amplified consequences. Additionally, the requirement for user interaction and privileges means that insider threats or compromised accounts could be leveraged to exploit this vulnerability, increasing risk in environments with less stringent access controls.

To mitigate this vulnerability effectively, European organizations should: 1) Monitor for and apply vendor patches promptly once available, as no official patch links are currently provided. 2) Implement strict input validation and output encoding on all user-supplied content, especially in web components rendering gallery content. 3) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. 4) Conduct regular security audits and penetration testing focused on web application vulnerabilities, including stored XSS. 5) Limit user privileges to the minimum necessary to reduce the risk of exploitation by privileged users. 6) Educate users about the risks of interacting with untrusted content and suspicious links. 7) Use web application firewalls (WAFs) configured to detect and block common XSS attack patterns targeting the Meow Gallery plugin. 8) Monitor logs and user behavior for signs of exploitation attempts or anomalous activity related to the plugin.