CVE-2025-4284 is a Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the Agentis product developed by Rolantis Information Technologies. This vulnerability arises from improper neutralization of input during web page generation, allowing malicious actors to inject and execute arbitrary scripts in the context of a victim's browser. Specifically, the flaw enables both Reflected XSS and DOM-Based XSS attacks. Reflected XSS occurs when malicious input is immediately echoed by the web application in an unsafe manner, while DOM-Based XSS involves client-side scripts that process untrusted data insecurely, leading to script execution without server-side involvement. The affected versions include all releases prior to 4.32. The vulnerability has a CVSS 3.1 base score of 6.1, indicating a medium severity level. The vector details (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) reveal that the attack can be launched remotely over the network without privileges, requires low attack complexity, no privileges, but does require user interaction (e.g., clicking a crafted link). The scope is changed, meaning the vulnerability affects components beyond the initially vulnerable component, and the impact is limited to low confidentiality and integrity loss, with no impact on availability. No known exploits are currently reported in the wild, and no official patches have been linked yet. The vulnerability could be exploited to steal sensitive information such as session cookies, perform actions on behalf of the user, or manipulate the user interface, potentially leading to further compromise or data leakage.

For European organizations using Agentis prior to version 4.32, this vulnerability poses a significant risk to the confidentiality and integrity of user sessions and data. Exploitation could lead to unauthorized access to sensitive information, session hijacking, or manipulation of web application behavior, which may result in data breaches or unauthorized transactions. Given the medium severity and the requirement for user interaction, the threat is more pronounced in environments where users are less security-aware or where phishing campaigns could be effective. Sectors such as finance, healthcare, and government agencies in Europe, which often handle sensitive personal and financial data, could face reputational damage, regulatory penalties under GDPR, and operational disruptions if exploited. Additionally, the scope change indicates that the impact could extend beyond the immediate vulnerable component, potentially affecting integrated systems or services relying on Agentis.

European organizations should prioritize upgrading Agentis to version 4.32 or later once available, as this is the definitive fix for the vulnerability. In the interim, organizations should implement strict input validation and output encoding on all user-supplied data within their web applications 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. Security teams should conduct thorough code reviews focusing on client-side scripts to identify and remediate unsafe DOM manipulations. User awareness training is critical to reduce the risk of successful phishing or social engineering attempts that could trigger the required user interaction. Web Application Firewalls (WAFs) configured to detect and block common XSS payloads can provide an additional layer of defense. Regular monitoring of web traffic and logs for suspicious activity related to XSS attempts is recommended. Finally, organizations should maintain an incident response plan tailored to web application attacks to quickly contain and remediate any exploitation attempts.