CVE-2025-47666 is a reflected Cross-site Scripting (XSS) vulnerability affecting the LambertGroup Image&Video FullScreen Background plugin, specifically versions up to and including 1.6.7. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, particularly in the 'lbg_fullscreen_fullwidth_slider' component. This flaw allows an attacker to craft malicious URLs or input that, when visited or submitted by a victim, results in the execution of arbitrary JavaScript code within the victim's browser context. The vulnerability does not require any prior authentication but does require user interaction, such as clicking a malicious link. The CVSS 3.1 base score is 6.1, indicating a medium severity level, with attack vector network, low attack complexity, no privileges required, user interaction required, and scope changed. The impact affects confidentiality and integrity, potentially enabling theft of session cookies, defacement, or redirection to malicious sites, but does not affect availability. No public exploits or patches are currently documented, highlighting the importance of proactive mitigation. The vulnerability is relevant to websites using this plugin, which is typically deployed in WordPress environments to provide fullscreen image and video backgrounds.

For European organizations, this vulnerability poses a moderate risk primarily to web applications using the LambertGroup Image&Video FullScreen Background plugin. Successful exploitation can lead to theft of user credentials, session hijacking, or unauthorized manipulation of web content, potentially damaging organizational reputation and user trust. Sectors with high web presence such as e-commerce, media, and public services could face targeted attacks exploiting this vulnerability. While the impact on availability is negligible, the confidentiality and integrity breaches could facilitate further attacks or data leakage. Given the plugin’s usage in multimedia-rich websites, organizations relying on interactive or customer-facing portals are particularly vulnerable. Additionally, regulatory frameworks like GDPR impose strict requirements on protecting user data, so exploitation could lead to compliance issues and fines if personal data is compromised.

Organizations should monitor for updates from LambertGroup and apply patches promptly once available. In the absence of an official patch, temporary mitigations include implementing strict input validation and output encoding on all user-supplied data to prevent script injection. Deploying a robust Content Security Policy (CSP) can help restrict the execution of unauthorized scripts. Web Application Firewalls (WAFs) should be configured to detect and block common XSS attack patterns targeting this plugin. Security teams should conduct regular code reviews and penetration testing focusing on input handling in the affected plugin components. Additionally, educating users to avoid clicking suspicious links can reduce the risk of exploitation. Logging and monitoring web traffic for anomalous requests related to the plugin can aid in early detection of attempted attacks.