CVE-2025-40663 is a stored Cross-Site Scripting (XSS) vulnerability identified in the i2A Cronos product, specifically version 23.02.01.17. The vulnerability arises from improper neutralization of input during web page generation (CWE-79), allowing an authenticated attacker to upload a malicious SVG image into the user's personal space located at /CronosWeb/Modules/Persons/PersonalDocuments/PersonalDocuments. Because the malicious SVG is stored and later rendered by the application, it can execute arbitrary JavaScript code in the context of the victim's browser when the personal documents page is viewed. This can lead to session hijacking, credential theft, or unauthorized actions performed on behalf of the victim. The vulnerability requires the attacker to have authenticated access, but no elevated privileges are necessary, and no user interaction beyond viewing the malicious content is required. The CVSS 4.0 base score is 5.1, indicating a medium severity level. No patches or fixes have been reported at the time of publication, and no known exploits have been observed in the wild. The vulnerability's attack vector is network-based with low attack complexity, and it does not require user interaction beyond the victim viewing the malicious content. The scope is limited to the affected version of i2A Cronos, and the impact is primarily on confidentiality and integrity through potential session compromise or data manipulation via XSS.

For European organizations using i2A Cronos version 23.02.01.17, this vulnerability poses a moderate risk. Since the exploit requires authenticated access, the threat is more significant in environments where user credentials may be compromised or where insider threats exist. Successful exploitation could lead to unauthorized access to sensitive personal documents, session hijacking, or execution of malicious scripts that could pivot to further attacks within the network. Given that i2A Cronos is used for personnel document management, exposure of personal or HR-related data could lead to privacy violations under GDPR, resulting in regulatory penalties and reputational damage. Additionally, the ability to execute scripts in users' browsers could facilitate phishing or social engineering campaigns targeting employees. The lack of a current fix increases the urgency for organizations to implement compensating controls. The impact on availability is minimal, but confidentiality and integrity risks are notable, especially in sectors handling sensitive employee data such as government, finance, and healthcare within Europe.

Since no official patch is available, European organizations should implement the following specific mitigations: 1) Restrict upload permissions to trusted users only and enforce strict authentication and authorization controls to minimize the risk of malicious uploads. 2) Implement server-side validation and sanitization of uploaded SVG files to detect and block embedded scripts or suspicious content before storage. 3) Employ Content Security Policy (CSP) headers to restrict the execution of inline scripts and limit the sources of executable content in the affected web application. 4) Monitor and audit user uploads and access logs for unusual activity indicative of exploitation attempts. 5) Educate users to avoid opening suspicious personal documents or links within the application. 6) Consider isolating or sandboxing the personal documents module to limit the impact of any successful XSS attack. 7) Engage with the vendor for updates and apply patches promptly once available. 8) If feasible, temporarily disable SVG uploads or restrict allowed file types until a fix is released.