CVE-2025-13058 is a cross-site scripting vulnerability discovered in soerennb eXtplorer, a web-based file management tool, affecting all versions up to 2.1.15. The vulnerability resides in an unspecified function within the Filename Handler component, which fails to properly sanitize user-supplied input. This flaw allows remote attackers to inject malicious JavaScript code that executes in the context of the victim's browser when they interact with the affected functionality. The attack vector is remote and does not require authentication, though some user interaction is necessary to trigger the payload. The vulnerability impacts the confidentiality and integrity of user sessions by enabling actions such as session hijacking, credential theft, or phishing. The CVSS 4.0 base score is 5.1 (medium severity), reflecting the ease of exploitation and limited scope of impact. A patch has been released (commit 002def70b985f7012586df2c44368845bf405ab3) to address the input validation issues. No public exploits or active exploitation campaigns have been reported to date. Organizations using eXtplorer should review their deployments and apply the patch to mitigate this risk.

For European organizations, this vulnerability poses a moderate risk primarily to confidentiality and integrity of user data and sessions. Since eXtplorer is often used for file management in web environments, exploitation could lead to unauthorized access to sensitive information or manipulation of user sessions. This could facilitate further attacks such as credential theft or lateral movement within networks. The requirement for user interaction limits the attack's immediacy but does not eliminate risk, especially in environments with less security awareness. Industries relying on eXtplorer for critical file operations, including government, finance, and healthcare sectors, could face operational disruptions or data breaches if exploited. The absence of known exploits reduces immediate threat but patching remains urgent to prevent future attacks. The vulnerability could also be leveraged in targeted phishing campaigns against European users of the affected software.

1. Apply the official patch identified by commit 002def70b985f7012586df2c44368845bf405ab3 immediately to all affected eXtplorer instances. 2. Implement strict input validation and output encoding on all user-supplied data, especially within the Filename Handler component, to prevent script injection. 3. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers accessing eXtplorer. 4. Conduct user awareness training to recognize and avoid phishing attempts that might leverage this vulnerability. 5. Monitor web server and application logs for unusual activity or attempts to exploit XSS vectors. 6. Restrict access to eXtplorer interfaces to trusted networks or via VPN to reduce exposure. 7. Regularly review and update web application security configurations and perform penetration testing to detect similar vulnerabilities.