CVE-2025-49066 identifies a reflected Cross-site Scripting (XSS) vulnerability in the Accordion Slider PRO plugin developed by LambertGroup, affecting versions up to 1.2. The vulnerability is caused by improper neutralization of input during web page generation, allowing attackers to inject malicious JavaScript code into web pages dynamically generated by the plugin. When a victim accesses a specially crafted URL containing malicious payloads, the injected script executes in their browser context. This reflected XSS does not require authentication but does require user interaction, such as clicking a malicious link. The vulnerability impacts the confidentiality and integrity of user data by potentially allowing attackers to steal session cookies, perform actions on behalf of the user, or manipulate the displayed content. The CVSS 3.1 base score of 6.1 reflects a medium severity, with an attack vector over the network, low attack complexity, no privileges required, but requiring user interaction and affecting confidentiality and integrity with a scope change. No patches or exploit code are currently publicly available, and no known exploits in the wild have been reported. The plugin is commonly used in WordPress environments to create accordion-style sliders, often on commercial or content-heavy websites. As such, this vulnerability could be leveraged in targeted phishing campaigns or drive-by attacks to compromise users visiting affected sites.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on the Accordion Slider PRO plugin on public-facing websites. Successful exploitation can lead to session hijacking, unauthorized actions performed under the victim's credentials, and defacement or misinformation through content manipulation. This can damage brand reputation, lead to data breaches involving user credentials or personal data, and potentially violate GDPR requirements concerning data protection and breach notification. E-commerce platforms and service providers using the plugin may face financial losses and customer trust erosion. While the vulnerability does not directly affect system availability, the indirect consequences of compromised user sessions and data integrity can disrupt business operations and customer interactions. Organizations with high web traffic and customer engagement are particularly at risk, as attackers can leverage the vulnerability to conduct widespread phishing or social engineering attacks targeting European users.

Organizations should monitor LambertGroup's official channels for patches addressing this vulnerability and apply updates promptly once available. In the interim, implement strict Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. Employ server-side input validation and sanitization to ensure that user-supplied data is properly neutralized before rendering. Web Application Firewalls (WAFs) can be configured to detect and block common XSS attack patterns targeting the plugin's endpoints. Additionally, educate users and administrators about the risks of clicking untrusted links and encourage the use of security-focused browser extensions that can mitigate script injection risks. Conduct regular security audits and penetration testing focusing on web application vulnerabilities, including XSS. Finally, consider disabling or replacing the Accordion Slider PRO plugin with alternative solutions that have a stronger security track record until a secure version is confirmed.