External risk intelligence

Adobe ColdFusion Unrestricted File Upload Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 10.0)

CVE-2026-48276

Adobe ColdFusion is a web application platform frequently deployed as a public-facing web server or API gateway. Because it is intended to serve web content and process requests, its primary function involves being reachable from the internet, making it a common target for external network-based interaction.

Unrestricted File Upload

Adobe Coldfusion

20232025

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability in Adobe ColdFusion allows for unrestricted file uploads, potentially leading to arbitrary code execution. This issue affects the core functionality of the application and could have significant security implications if exploited.

  • Unrestricted file uploads can allow code execution.
  • Confirms critical risk for public-facing web applications.
  • Assess relevance and exposure for ColdFusion instances.

Attack Path

How an attacker could exploit the issue

An attacker can reach Adobe ColdFusion through the network and upload a dangerous file without needing any user interaction or special privileges. This capability allows them to execute arbitrary code on the affected system, gaining control within the context of the current user.

  • Accessible via network with no authentication.
  • Unrestricted file upload feature.
  • Arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated attacker to upload and execute arbitrary code on the affected server. This could occur if an attacker sends a specially crafted request that bypasses upload restrictions, leading to the execution of malicious code within the context of the running ColdFusion service.

  • Server code execution.
  • Unrestricted file upload.
  • Compromise of server resources.

Operational Fix

Recommended remediation, mitigation, and detection steps

Systems supporting Adobe ColdFusion deployments are likely the responsibility of application owners, with support from infrastructure or platform teams. The immediate first step is to locate all instances of ColdFusion, determine their exposure to the network, and confirm their business criticality. Once accountable owners are identified, a risk-based remediation plan can be developed.

  • Application owners should manage the remediation.
  • Verify network exposure and business criticality first.
  • Plan and coordinate remediation activities.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is Adobe ColdFusion?

Adobe ColdFusion is a commercial web application development platform. Organizations use it to build, deploy, and maintain dynamic websites and enterprise-level web applications. It functions as a server-side environment that processes code to generate HTML and interact with databases, often serving as the foundation for internal or public-facing business services.

What does CWE-434 mean for CVE-2026-48276?

CWE-434 refers to an Unrestricted Upload of File with Dangerous Type vulnerability. In this context, it means the application does not sufficiently validate the files being uploaded by users. Because the software fails to restrict these uploads, an attacker can submit malicious files that the server then executes, leading to arbitrary code execution within the system.

How can an attacker trigger this vulnerability?

An attacker triggers this by sending a specially crafted network request to the ColdFusion server that bypasses existing file upload restrictions. This process does not require user interaction or pre-existing authentication. Simply sending the malicious file request is sufficient to potentially execute code, as the bug affects the core functionality of the platform.

Why should I care about this Adobe ColdFusion bug?

Halo Surface Signal indicates that Adobe ColdFusion is frequently deployed as a public-facing web server or API gateway. Because its primary purpose is to process incoming network traffic, these instances are inherently reachable from the internet. This makes any ColdFusion server a priority for assessment, especially if it is accessible to external network users.

What are the first steps to address this issue?

Begin by identifying all running instances of Adobe ColdFusion across your environment and confirming their version numbers. Once mapped, determine the network reachability and business criticality of each instance. Coordinate with the relevant application owners to establish a remediation plan for these systems while prioritizing those that are internet-facing.

References