Overview
This blog post outlines a critical cybersecurity vulnerability in the popular Minecraft server website software, NamelessMC, known as CVE-2025-54117. The vulnerability, identified as a Cross-Site Scripting (XSS) issue, is found in versions of NamelessMC before 2.2.3. It has the potential to compromise the entire system or lead to data leakage, affecting both server owners and users. Given the widespread use of NamelessMC, understanding and addressing this vulnerability is of high importance to ensure the continued safety and security of Minecraft servers worldwide.
Vulnerability Summary
CVE ID: CVE-2025-54117
Severity: Critical, CVSS score 9.0
Attack Vector: Network
Privileges Required: User-level
User Interaction: Required
Impact: Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
NamelessMC | Before 2.2.3
How the Exploit Works
The XSS vulnerability in NamelessMC exists because the software does not properly sanitize user input in the dashboard text editor component. This allows an authenticated user to inject arbitrary web scripts or HTML into the application. When this malicious script is executed in the browser of a victim, it can lead to various undesirable outcomes including stealing user sessions, defacing web sites, or even, potentially, remote code execution on the server.
Conceptual Example Code
Here’s a conceptual example of how the vulnerability might be exploited. The attacker sends a POST request with the malicious script as the payload:
POST /dashboard/text-editor HTTP/1.1
Host: targetminecraftserver.com
Content-Type: application/json
{ "text": "<script>malicious_code_here</script>" }This code, when executed in the browser of an unsuspecting user, could lead to a range of destructive actions, depending on the nature of the injected script.
Remediation and Mitigation
The vulnerability has been fixed in version 2.2.4 of NamelessMC. Users are strongly encouraged to update their software to this version or any later version to protect their systems. In the interim, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used to mitigate the risk. These tools can help to detect and block malicious scripts before they reach the application.