CVE-2018-10213 is a cross-site scripting (XSS) vulnerability discovered in Vaultize Enterprise File Sharing version 17.05.31. The vulnerability arises from the way invitation emails are handled when received from other users. Specifically, an attacker who can send an invitation email to a target user can modify the HTML content of that email before sending it. This allows the attacker to inject malicious scripts into the email content. When the recipient opens the invitation email, the malicious script executes in the context of the user's email client or web interface, potentially leading to session hijacking, credential theft, or other malicious actions that exploit the victim's trust in the email content. The vulnerability is a classic example of reflected or stored XSS, where user-controllable input is not properly sanitized or encoded before being rendered in an HTML context. No CVSS score is provided for this vulnerability, and there is no indication of known exploits in the wild. The affected product is Vaultize Enterprise File Sharing, a solution used for secure file sharing and collaboration, which implies that the vulnerability could be leveraged to compromise sensitive enterprise data or user accounts if exploited.

For European organizations using Vaultize Enterprise File Sharing, this vulnerability poses a risk to confidentiality and integrity of sensitive data. An attacker exploiting this XSS flaw could execute arbitrary scripts in the context of the victim's session, potentially leading to unauthorized access to shared files, theft of credentials, or further lateral movement within the enterprise network. This could result in data breaches, loss of intellectual property, or compliance violations under regulations such as GDPR. Additionally, the trust model of enterprise file sharing is undermined, as users may receive malicious invitations appearing to come from legitimate colleagues. While availability impact is limited, the reputational damage and operational disruption caused by a successful attack could be significant. The risk is heightened in environments where users frequently share files and collaborate via email invitations, making phishing and social engineering attacks more effective.

To mitigate this vulnerability, organizations should apply any available patches or updates from Vaultize addressing this XSS issue. In the absence of a patch, administrators should implement strict input validation and output encoding on all user-supplied content in invitation emails to prevent HTML or script injection. Email clients and web interfaces should be configured to disable or limit the execution of active content in emails, such as JavaScript. User awareness training should emphasize caution when opening invitation emails, especially those with unexpected or suspicious content. Network-level protections like email filtering and sandboxing can help detect and block malicious payloads. Additionally, organizations should monitor logs for unusual invitation activity and consider restricting invitation sending privileges to trusted users only. Implementing Content Security Policy (CSP) headers in the web interface can further reduce the risk of script execution from injected content.