Overview
The CVE-2025-52902 vulnerability is a high severity Stored Cross-Site-Scripting (XSS) issue that affects File Browser versions prior to v2.33.7. This vulnerability is particularly precarious as it can lead to system compromise or data leakage, making it a significant threat to organizations that use this software.
Vulnerability Summary
CVE ID: CVE-2025-52902
Severity: High (CVSS 7.6)
Attack Vector: Network
Privileges Required: Low
User Interaction: Required
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
File Browser | Prior to v2.33.7
How the Exploit Works
The vulnerability lies in the Markdown preview function of File Browser. If a user uploads a Markdown file that contains JavaScript code, this code will be executed by the browser when the file is previewed. This opens up a potential avenue for Stored Cross-Site-Scripting (XSS) attacks, allowing malicious actors to remotely execute arbitrary code and potentially gain unauthorized access to sensitive data.
Conceptual Example Code
Below is a conceptual example of how the vulnerability could be exploited:
# Innocent Looking Markdown File
Some innocent-looking content here...
<script>
// Malicious JavaScript code here...
document.cookie = "sessionID=" + document.cookie.split(';')[0];
</script>When this Markdown file is uploaded and previewed in the File Browser, the malicious JavaScript within the script tags will be executed.
Mitigation Recommendations
Users are advised to update their File Browser software to version 2.33.7 or later, which contains a fix for the issue. If updating is not immediately possible, implementing Web Application Firewall (WAF) or Intrusion Detection System (IDS) rules to prevent the execution of JavaScript within Markdown files can serve as a temporary mitigation.
