External risk intelligence

Adobe ColdFusion Unrestricted File Upload for Code Execution

CVE advisorySeverity: CRITICAL (CVSS 10.0)

CVE-2026-48283

Adobe ColdFusion is a commercial application server and development platform commonly deployed to host public-facing web applications and APIs. While it can be used in internal environments, its primary role is to serve dynamic web content to users, making it a frequent candidate for internet-facing exposure in standard enterprise deployments.

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 has been identified in Adobe ColdFusion that allows an attacker to execute arbitrary code. This issue affects the unrestricted upload of dangerous file types and does not require user interaction to exploit, with the potential for significant impact.

Code execution risk via file uploads.
Critical vulnerability with broad impact.
Confirm ColdFusion relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by uploading a specially crafted file to an exposed Adobe ColdFusion instance. This could allow them to execute arbitrary code on the server, as the vulnerability bypasses restrictions on file types that can be uploaded. The attack does not require any interaction from a user.

Unrestricted file upload access required.
Uploading a dangerous file type triggers vulnerability.
Potential for arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated attacker to execute arbitrary code on a vulnerable ColdFusion server. This could impact the server's operating system and any data it processes or stores, depending on the permissions of the user running ColdFusion.

System data and services at risk.
Arbitrary code execution via uploaded file.
Complete system compromise possible.

Operational Fix

Recommended remediation, mitigation, and detection steps

Application owners and infrastructure teams are likely responsible for addressing this vulnerability in Adobe ColdFusion. The immediate first step is to identify all instances of the affected software, determine their exposure and criticality, and confirm the accountable owner. Subsequently, remediation efforts should be planned and executed based on the identified risks.

Application owners should manage the issue.
Verify internet-facing and critical instances first.
Plan and execute remediation actions.

Supplementary metadata

CVSS vector

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.

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Frequently asked questions

What is Adobe ColdFusion?

Adobe ColdFusion is a commercial application server and development platform. Organizations use it to build, manage, and host dynamic websites and APIs. It functions as an environment that processes code to deliver content to users, often acting as a bridge between a web interface and backend systems.

What does CVE-2026-48283 mean by unrestricted file upload?

This vulnerability, classified as CWE-434, occurs when software fails to properly check the type or content of files being uploaded. In this CVE, an attacker can upload a malicious file that the server mistakenly accepts and processes. Because the system does not limit file types, it allows an attacker to execute arbitrary code directly on the server, gaining control over the system's operations.

How does an attacker trigger this vulnerability?

An attacker exploits this by sending a specially crafted file to the target ColdFusion instance. The vulnerability does not require any interaction from a user or administrator to work. Note that this bug is not triggered by standard, legitimate file operations performed by authorized users; it specifically requires the successful upload of a dangerous file type intended to bypass existing security controls.

Why is this CVE high priority for my team?

Halo Surface Signal notes that ColdFusion is frequently deployed to serve dynamic web content, which often leads to internet-facing exposure. Because this vulnerability allows for remote execution without user interaction, any ColdFusion instance accessible from the internet is a primary target. Even internal instances should be reviewed if they handle sensitive data or reside in critical service segments.

What are the first steps to secure my ColdFusion instances?

Begin by inventorying your environment to locate all running versions of Adobe ColdFusion. Identify which instances are internet-facing, as these represent the most immediate risk. Once you have a clear map of your assets and their exposure, coordinate with the accountable application owners to prioritize these systems for formal remediation and updates.

References

helpx.adobe.com/security/products/coldfusion/apsb26-68.html

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.