Description

Unrestricted Upload of File with Dangerous Type in core/modules/media.php in CuteNews v.2.1.2 allows remote authenticated users with access to the Media Manager panel to execute arbitrary code in the context of the web application, leading to remote server access by triggering a reverse shell.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.2",
  "pubDate": "2026-09-21T16:17:07.470Z",
  "pubdate": "2026-09-21T16:17:07.470Z",
  "executiveSummary": "CuteNews version 2.1.2 is susceptible to an Unrestricted Upload of File with Dangerous Type vulnerability located within the core/modules/media.php component.\nThis vulnerability allows a remote authenticated user with access to the Media Manager panel to bypass file validation mechanisms and upload malicious files to the server.\nThe successful exploitation of this flaw enables the execution of arbitrary code within the context of the web application, facilitating unauthorized remote server access.\nThe risk is critical, as an attacker can weaponize this entry point to establish a reverse shell, potentially leading to full system compromise, data exfiltration, and lateral movement within the hosting environment.\nExploitation requires authenticated access to the Media Manager interface, meaning an attacker must already possess valid credentials or hijack an existing session to perform the attack.",
  "technicalDetails": "The vulnerability resides in the core/modules/media.php file, which handles file upload operations for the Media Manager module in CuteNews 2.1.2. The root cause is a failure to properly sanitize, validate, or restrict the file extensions and MIME types of uploaded content before processing and saving the files to the web server's file system.\nThe attack flow initiates when an authenticated user navigates to the Media Manager panel. By bypassing client-side validation or directly interacting with the backend endpoint exposed by core/modules/media.php, an attacker can upload a malicious script—typically a PHP web shell—disguised as an innocuous file or simply by submitting a script with an executable extension that the server fails to filter.\nOnce the file is uploaded, the application stores it in an accessible directory on the web server. The attacker can then trigger the execution of the uploaded code by sending a direct HTTP request to the file's path. Since the server's web process executes the script within the application's security context, the malicious payload gains the privileges assigned to the web server user.\nThe primary post-exploitation objective is often the establishment of a reverse shell. By crafting a payload that initiates a connection back to an attacker-controlled listener, the adversary can bypass restrictive firewall configurations that might otherwise block inbound connections to the server. Once the reverse shell is established, the attacker gains interactive command-line access to the underlying operating system.\nThe impact of this vulnerability is severe, as it effectively transforms the Media Manager from a file repository into an execution vector for arbitrary code. Beyond remote command execution, this access allows for the modification of application files, unauthorized access to the database configuration, credential harvesting, and the potential escalation of privileges to gain root access on the server if the application environment is misconfigured."
}