CVE-2025-52764 identifies a reflected Cross-site Scripting (XSS) vulnerability in the marielav flexoslider plugin, a web component used to create image sliders on websites. The vulnerability stems from improper neutralization of user-supplied input during web page generation, which allows malicious actors to inject and execute arbitrary JavaScript code in the context of the victim's browser session. This reflected XSS does not require prior authentication but does require user interaction, such as clicking a maliciously crafted URL. The vulnerability affects all versions of flexoslider up to and including 1.0004. The CVSS 3.1 base score of 6.1 reflects a medium severity, with an attack vector of network (remote), low attack complexity, no privileges required, and user interaction needed. The scope is changed, indicating that the vulnerability affects components beyond the vulnerable module, potentially impacting the confidentiality and integrity of user data handled by the affected web application. No known exploits have been reported in the wild, and no official patches or mitigation links have been published at this time. The vulnerability could be leveraged to steal session cookies, perform actions on behalf of users, or redirect users to malicious sites, thereby compromising user trust and data security.

For European organizations, this vulnerability poses a risk primarily to web applications that integrate the marielav flexoslider plugin, especially those with public-facing websites that rely on dynamic content generation. Successful exploitation could lead to theft of sensitive user information such as session tokens, enabling account hijacking or unauthorized actions. This can damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR breaches due to compromised personal data), and cause financial losses. Sectors like e-commerce, media, and online services are particularly vulnerable due to their reliance on interactive web components. Although the vulnerability does not directly impact availability, the indirect effects of compromised user trust and potential data leakage can be significant. The requirement for user interaction limits automated exploitation but does not eliminate risk, especially in phishing or social engineering scenarios common in Europe.

European organizations should immediately audit their web environments to identify the use of marielav flexoslider versions up to 1.0004. Until an official patch is released, implement strict input validation and output encoding on all user-supplied data that interacts with the flexoslider component to prevent script injection. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. Additionally, enable HTTP-only and Secure flags on cookies to protect session data from theft via XSS. Conduct user awareness training to reduce the risk of successful phishing attacks that could trigger exploitation. Monitor web traffic and logs for suspicious requests that may indicate attempted exploitation. Finally, maintain close contact with the vendor or security advisories for timely patch deployment once available.