CVE-2025-13058 identifies a cross-site scripting vulnerability in soerennb eXtplorer, a web-based file management tool, affecting all versions up to 2.1.15. The vulnerability is located within an unspecified function of the Filename Handler component, which improperly sanitizes user input, allowing attackers to inject malicious JavaScript code. This flaw can be exploited remotely without authentication, but requires user interaction, such as clicking a crafted link or accessing a malicious file name displayed by the application. Successful exploitation could enable attackers to execute scripts in the context of the victim’s browser session, potentially leading to session hijacking, defacement, or redirection to malicious sites. The vulnerability does not impact system confidentiality or availability directly but poses a risk to user data integrity and privacy. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges required, user interaction required, and low impact on integrity with no impact on confidentiality or availability. No known public exploits exist yet, but a patch identified by commit 002def70b985f7012586df2c44368845bf405ab3 has been released to address the issue. Organizations using eXtplorer should apply this patch promptly to mitigate potential exploitation.

For European organizations, this vulnerability poses a moderate risk primarily to web applications relying on soerennb eXtplorer for file management. Exploitation could lead to unauthorized script execution in users’ browsers, potentially compromising session tokens, enabling phishing attacks, or defacing web interfaces. While it does not directly compromise backend systems or data confidentiality, the integrity of user interactions and trust in the application can be undermined. Sectors with high reliance on web-based file management, such as government agencies, educational institutions, and enterprises managing sensitive documents, may face reputational damage or targeted social engineering attacks. The remote exploitability without authentication increases the attack surface, especially in environments where eXtplorer is exposed to the internet. However, the requirement for user interaction and the limited scope of impact reduce the likelihood of widespread severe damage. Timely patching is essential to prevent attackers from leveraging this vulnerability in targeted campaigns.

European organizations should immediately identify all instances of soerennb eXtplorer in their environments and verify the version in use. Applying the official patch corresponding to commit 002def70b985f7012586df2c44368845bf405ab3 is the primary mitigation step. In addition, organizations should implement strict input validation and output encoding on all user-supplied data, especially filenames and parameters displayed in the UI, to prevent XSS. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. Regularly audit and monitor web application logs for suspicious activities indicative of XSS exploitation attempts. Educate users about the risks of clicking unknown links or interacting with untrusted file names within the application. Network segmentation and limiting public exposure of eXtplorer instances can further reduce risk. Finally, integrate vulnerability scanning and penetration testing focused on web application security to detect similar issues proactively.