CVE-2018-10209 is a security vulnerability identified in Vaultize Enterprise File Sharing version 17.05.31. The issue is a Stored Cross-Site Scripting (XSS) vulnerability that occurs on the file or folder download pop-up interface. Specifically, an attacker can craft malicious file or folder names containing executable scripts. When a user accesses the download pop-up for these files or folders, the embedded script is executed in the context of the user's browser session. Stored XSS vulnerabilities are particularly dangerous because the malicious payload is saved on the server and delivered to any user who views the affected content, potentially leading to widespread exploitation. This can result in session hijacking, credential theft, unauthorized actions on behalf of the user, or distribution of malware. The vulnerability arises due to insufficient input validation and output encoding of file or folder names displayed in the download pop-up UI. No CVSS score has been assigned, and there are no known exploits in the wild reported. The affected product is Vaultize Enterprise File Sharing, a solution used for secure file sharing and collaboration, though specific affected versions beyond 17.05.31 are not detailed. No official patches or mitigation links are provided in the source information.

For European organizations, this vulnerability poses a significant risk especially for enterprises relying on Vaultize Enterprise File Sharing for secure document exchange and collaboration. Exploitation could lead to unauthorized access to sensitive corporate data, leakage of confidential information, and compromise of user credentials. Given the nature of stored XSS, attackers could execute arbitrary scripts in the browsers of employees, potentially enabling lateral movement within corporate networks or facilitating phishing attacks that appear highly credible. This risk is heightened in sectors with stringent data protection requirements such as finance, healthcare, and government institutions prevalent across Europe. Additionally, exploitation could lead to non-compliance with GDPR mandates on data security and breach notification, resulting in legal and financial penalties. The absence of known exploits in the wild suggests limited active targeting, but the vulnerability remains a latent threat if unaddressed.

To mitigate this vulnerability, European organizations using Vaultize Enterprise File Sharing should implement the following specific measures: 1) Immediately review and sanitize all file and folder names uploaded to the system to remove or encode potentially malicious characters or scripts. 2) Apply strict input validation and output encoding on the download pop-up interface to neutralize any embedded scripts in file or folder names. 3) If available, upgrade to a patched or newer version of Vaultize Enterprise File Sharing that addresses this vulnerability; if no patch exists, contact the vendor for guidance or consider alternative secure file sharing solutions. 4) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts within the application context. 5) Conduct regular security awareness training for users to recognize suspicious behavior and report anomalies. 6) Monitor web application logs for unusual activity related to file or folder name inputs and download pop-up access. 7) Consider implementing Web Application Firewalls (WAF) with rules to detect and block XSS payloads targeting the file sharing platform.