CVE-2025-52764 identifies a reflected Cross-site Scripting (XSS) vulnerability in the marielav flexoslider plugin, a web component used for creating image sliders on websites. 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 the victim's browser. This reflected XSS does not require prior authentication but does require user interaction, typically by enticing a user to click a specially crafted URL containing malicious payloads. The vulnerability affects all versions of flexoslider up to and including 1.0004. The CVSS 3.1 base score is 6.1, indicating a medium severity level, with the vector AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N, meaning it is remotely exploitable over the network with low attack complexity, no privileges required, but requires user interaction. The scope is changed (S:C), indicating the vulnerability affects resources beyond the vulnerable component itself. The impact includes limited confidentiality and integrity loss, such as theft of session cookies or manipulation of page content, but no direct impact on availability. No patches or known exploits are currently reported, but the vulnerability poses a risk especially to websites that rely on flexoslider for dynamic content display. Attackers could leverage this to perform phishing, session hijacking, or defacement attacks.

For European organizations, the reflected XSS vulnerability in flexoslider can lead to significant security risks, especially for those relying on this plugin in customer-facing websites or internal portals. Successful exploitation could compromise user sessions, leading to unauthorized access to sensitive information or manipulation of user interactions. This can damage organizational reputation, lead to data breaches, and violate data protection regulations such as GDPR. The impact is particularly critical for sectors handling sensitive personal data, including finance, healthcare, and e-commerce. Additionally, the reflected nature of the XSS means phishing campaigns can be more convincing by leveraging legitimate website domains. The medium severity rating suggests that while the vulnerability is not trivially exploitable without user action, the potential for targeted attacks remains. European organizations with high web traffic and user engagement are at increased risk of exploitation attempts.

To mitigate CVE-2025-52764, organizations should first verify if they use the marielav flexoslider plugin and identify the version in use. Since no official patch links are currently available, immediate mitigations include implementing strict input validation and output encoding on all user-supplied data that is reflected in web pages. Employing 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 typical XSS payloads targeting flexoslider endpoints. Additionally, organizations should educate users about the risks of clicking suspicious links and monitor web logs for unusual request patterns indicative of exploitation attempts. Regularly updating the plugin once a patch is released is critical. Developers should review and refactor code to ensure proper sanitization of inputs and consider adopting security-focused development frameworks. Finally, penetration testing and vulnerability scanning should be conducted to validate the effectiveness of mitigations.