CVE-2025-27004 identifies a reflected Cross-site Scripting (XSS) vulnerability in the LambertGroup Famous - Responsive Image And Video Grid Gallery WordPress plugin, specifically in versions up to 1.4. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, allowing malicious scripts to be injected and executed in the context of users visiting affected sites. This reflected XSS does not require authentication but does require user interaction, typically through clicking a crafted URL. The CVSS 3.1 base score of 6.1 reflects a medium severity, with attack vector being network (remote), low attack complexity, no privileges required, but user interaction necessary. The scope is changed (S:C), indicating the vulnerability can affect components beyond the vulnerable plugin itself. The impact affects confidentiality and integrity by enabling attackers to steal session cookies, perform actions on behalf of users, or deliver further payloads. There is no direct impact on availability. No known exploits are currently reported in the wild, but the vulnerability is publicly disclosed and thus may attract attackers. The plugin is used in WordPress environments to display responsive image and video grids, common in many websites. The vulnerability highlights the importance of proper input validation and output encoding in web applications, especially plugins that handle dynamic content generation. The lack of a patch link suggests remediation is pending or not yet published, emphasizing the need for vigilance.

For European organizations, this vulnerability poses a moderate risk primarily to websites using the affected WordPress plugin. Exploitation could lead to theft of sensitive user information such as session tokens or credentials, unauthorized actions performed on behalf of users, and potential reputational damage if customer data is compromised. Given the plugin’s role in rendering media galleries, attackers could leverage this to target site visitors, including customers or employees accessing corporate resources. The reflected nature of the XSS means phishing or social engineering could be used to lure victims into triggering the exploit. While availability is not impacted, the confidentiality and integrity risks could lead to broader security incidents, including lateral movement or data breaches. European organizations with customer-facing websites or internal portals using this plugin are at risk, especially if they lack robust web security controls. The absence of known exploits in the wild reduces immediate urgency but does not eliminate risk, as attackers often develop exploits rapidly after disclosure.

1. Monitor for official patches or updates from LambertGroup and apply them immediately once available to remediate the vulnerability. 2. In the interim, implement Web Application Firewalls (WAFs) with rules to detect and block reflected XSS payloads targeting the plugin’s endpoints. 3. Employ strict Content Security Policies (CSP) to restrict execution of unauthorized scripts in browsers. 4. Conduct thorough input validation and output encoding on any user-supplied data within custom site code or integrations related to the plugin. 5. Educate users and administrators about phishing risks associated with reflected XSS attacks to reduce successful exploitation via social engineering. 6. Regularly audit WordPress plugins for security updates and remove or replace plugins that are no longer maintained or have known vulnerabilities. 7. Use security plugins that provide additional XSS protection and scanning capabilities within WordPress environments. 8. Monitor web server and application logs for unusual requests or error patterns that may indicate exploitation attempts.