External risk intelligence

Responsive FileManager Unrestricted File Upload Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-5482

A critical vulnerability in Responsive FileManager allows unauthenticated attackers to upload unrestricted file types, potentially leading to remote code execution. As the project is unmaintained, understanding its presence and exposure is crucial for security. Attackers can exploit the `dialog.php` endpoint to execute

4Halo Surface Signal

Unrestricted File Upload

External exposure likelihood

Halo Surface Signal score for CVE-2026-5482

Responsive FileManager is a web-based file management component typically integrated into web applications and content management systems. As a web-facing interface used for managing files, its endpoints are often reachable over the internet when deployed as part of a public-facing web application.

PCI scan relevance

PCI Relevance for CVE-2026-5482

Yes

CVE-2026-5482 — Halo PCI Relevance: Yes. Under typical PCI ASV external scan criteria, this issue may be flagged for scan prioritization.

This CVE allows unauthenticated attackers to upload and execute arbitrary files, directly enabling Remote Code Execution (RCE). This type of vulnerability typically leads to an automatic failure in PCI ASV scans due to the severe security risk.

Scan-prioritization guidance only—not a PCI DSS certification or ASV attestation.

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in Responsive FileManager, a file management component, allowing unauthenticated attackers to upload any file type through a specific endpoint, potentially leading to remote code execution. Given that the project is unmaintained, confirming its presence and exposure within your environment is the primary concern.

Unrestricted file uploads can allow code execution.
Unmaintained software poses ongoing security risks.
Assess relevance and potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this vulnerability by accessing the `dialog.php` endpoint of Responsive FileManager. This endpoint allows for unrestricted file uploads of any type and extension. If successful, this can lead to the execution of arbitrary code on the affected system.

No authentication required to access.
Upload any file type to `dialog.php`.
Remote code execution on server.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in ResponsiveFileManager, when exposed to the internet, could allow an unauthenticated attacker to upload and execute arbitrary code. This could potentially impact the integrity and availability of the web application hosting the file manager.

Server-side code execution.
Unrestricted file uploads via dialog.php.
Compromised web application integrity.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Given that Responsive FileManager is an unmaintained web component, the most likely teams to address this critical vulnerability are application owners responsible for the integrated systems and potentially platform or infrastructure teams if it's a shared service. The first practical step is to identify all instances of this component, confirm their accessibility from external networks, and determine their business criticality to prioritize remediation efforts.

Identify accountable application owners.
Verify external accessibility and criticality.
Plan remediation based on risk.

Frequently asked questions

What is Responsive FileManager?

Responsive FileManager is a web-based component designed to handle file uploads and management within websites or content management systems. It typically provides a graphical interface for users to organize, upload, and select files. Because it is designed to be integrated into broader web applications, it acts as a functional utility layer rather than a standalone operating system or server application.

What does CVE-2026-5482 mean?

CVE-2026-5482 refers to an 'Unrestricted Upload of File with Dangerous Type' weakness, known as CWE-434. This means the software fails to properly check or limit the types of files being uploaded to the server. Because the system does not enforce restrictions on file extensions, an attacker can upload malicious scripts that the server might then execute, granting the attacker unauthorized control over the system.

How does an attacker trigger this vulnerability?

An attacker triggers this flaw by interacting directly with the 'dialog.php' endpoint within the software. This specific component is designed to accept file uploads but lacks the necessary security checks to verify file integrity. It is important to note that this process does not require any login credentials or user authentication; simply accessing the URL is enough for the malicious upload to occur.

How do I know if my system is at risk?

According to Halo Surface Signal, you should prioritize this if your instance is reachable over the internet. Because Responsive FileManager is often integrated into public-facing web applications, the 'dialog.php' endpoint may be accessible to remote users without internal network restrictions. Systems that are not exposed to the public internet generally have a lower immediate risk profile, though the vulnerability remains present if the software is installed.

What should I do if I use this software?

Since the project is no longer maintained, there will be no official security patches to fix this flaw. Your first step is to locate all instances of Responsive FileManager within your environment and evaluate their necessity. If the component is not required for critical business functions, the safest approach is to remove it entirely or disable the vulnerable endpoint to prevent unauthorized file uploads.

References

Written by Nicholas Merritt

External-surface CVE analysis and Halo Surface Signal prioritization for Halo Threat Intelligence.