CVE-2026-4344: Autodesk Fusion XSS Vulnerability

CVE-2026-4344 Overview

A Stored Cross-Site Scripting (XSS) vulnerability has been identified in the Autodesk Fusion desktop application. The vulnerability allows a malicious actor to inject crafted HTML payloads into component names, which are then executed when users interact with the delete confirmation dialog. This attack can lead to unauthorized file access and arbitrary code execution within the context of the current process.

Critical Impact

Successful exploitation enables attackers to read local files or execute arbitrary code in the context of the affected Autodesk Fusion process, potentially leading to data theft or system compromise.

Affected Products

• Autodesk Fusion Desktop Application (Windows)
• Autodesk Fusion Desktop Application (macOS)

Discovery Timeline

• April 14, 2026 - CVE-2026-4344 published to NVD
• April 14, 2026 - Last updated in NVD database

Technical Details for CVE-2026-4344

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The Autodesk Fusion desktop application fails to properly sanitize user-controlled input in component names before rendering them in the delete confirmation dialog. When a user clicks on or interacts with a maliciously named component during the deletion workflow, the injected HTML/JavaScript payload executes within the application context.

The local attack vector requires user interaction, as the victim must trigger the delete confirmation dialog containing the malicious component name. However, the impact is significant—attackers can leverage this vulnerability to read sensitive local files accessible to the Fusion process or execute arbitrary code with the same privileges as the running application.

Root Cause

The root cause lies in insufficient input validation and output encoding within the Autodesk Fusion application. Component names are accepted without proper sanitization, and when these names are rendered in the user interface (specifically the delete confirmation dialog), the application fails to escape HTML special characters. This allows injected script tags or event handlers to be interpreted and executed by the rendering engine.

Attack Vector

The attack requires local access to create or modify a component with a malicious name. The attacker crafts a component name containing HTML/JavaScript payload designed to execute when rendered. When an unsuspecting user attempts to delete the maliciously named component, the delete confirmation dialog displays the component name without proper encoding. If the user clicks or interacts with the dialog, the embedded script executes in the context of the Autodesk Fusion process.

The vulnerability exploits the trust relationship between user interface elements and the underlying rendering engine. Since Fusion desktop applications often use embedded web technologies for UI rendering, traditional XSS attack patterns can be effective in this desktop context, enabling file system access and process-level code execution that would not typically be possible in a sandboxed browser environment.

Detection Methods for CVE-2026-4344

Indicators of Compromise

• Unusual component names containing HTML tags, script elements, or JavaScript event handlers (e.g., <script>, onerror=, onclick=)
• Unexpected file access patterns from the Autodesk Fusion process
• Anomalous network connections originating from the Fusion application
• Suspicious child processes spawned by Autodesk Fusion

Detection Strategies

• Monitor Autodesk Fusion project files for component names containing HTML or JavaScript syntax patterns
• Implement endpoint detection rules to identify script execution anomalies within the Fusion process context
• Deploy behavioral analysis to detect unauthorized file read operations from the Fusion application
• Review application logs for rendering errors that may indicate injection attempts

Monitoring Recommendations

• Enable enhanced logging for user interface events within Autodesk Fusion if available
• Configure SentinelOne Singularity to monitor for suspicious process behavior from Autodesk Fusion executables
• Implement file integrity monitoring on project directories to detect malicious component modifications
• Alert on any attempts by Fusion processes to access sensitive system files outside normal operational scope

How to Mitigate CVE-2026-4344

Immediate Actions Required

• Update Autodesk Fusion to the latest patched version available from Autodesk
• Review existing project files for suspicious component names before opening
• Restrict access to shared project files to trusted collaborators only
• Enable SentinelOne's application control features to monitor Fusion process behavior

Patch Information

Autodesk has released security updates to address this vulnerability. Users should download the latest version of Autodesk Fusion from the official channels:

• Windows Users: Download the updated client from the Autodesk Fusion Client EXE
• macOS Users: Download the updated client from the Autodesk Fusion Client DMG

For complete vulnerability details and remediation guidance, refer to the Autodesk Security Advisory ADKS-SA-2026-0005.

Workarounds

• Avoid opening project files from untrusted or unknown sources until patches are applied
• Exercise caution when deleting components, especially those with unusual or suspicious names
• Consider running Autodesk Fusion with reduced privileges where possible
• Implement network segmentation to limit potential data exfiltration if exploitation occurs

# Configuration example
# Verify Autodesk Fusion version on Windows (PowerShell)
Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*" | Where-Object { $_.DisplayName -like "*Fusion*" } | Select-Object DisplayName, DisplayVersion

# Verify Autodesk Fusion version on macOS
defaults read /Applications/Autodesk\ Fusion.app/Contents/Info.plist CFBundleShortVersionString