CVE-2026-3418

Received Received - Intake

System REST API Arbitrary File Upload Vulnerability

Publication date: 2026-08-06

Last updated on: 2026-08-06

Assigner: WSO2 LLC

Description

The System REST API accepts user-supplied file uploads without enforcing sufficient validation on the file type or destination, allowing files to be written to arbitrary server-accessible locations. Exploitation requires authenticated administrative access with publisher privileges. Successful exploitation permits an authenticated publisher to upload files to server-accessible locations. Depending on the deployment environment and how uploaded files are handled, this could lead to the execution of uploaded content, potentially resulting in remote code execution.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-06

Last Modified

2026-08-06

Generated

2026-08-07

AI Q&A

2026-08-07

EPSS Evaluated

N/A

NVD

CVE-2026-3418

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-434	The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

Attack-Flow Graph

Executive Summary

This vulnerability allows authenticated users with publisher privileges to upload files to arbitrary server-accessible locations without proper validation of file type or destination. This could lead to remote code execution if the uploaded files are executed by the server.

Detection Guidance

Detecting this vulnerability requires checking for unauthorized file uploads or unexpected file writes in server-accessible locations. Review server logs for unusual file upload activity, especially from authenticated publisher accounts. Check directories where files are typically stored for unexpected or malicious files.

Impact Analysis

If exploited, this vulnerability could allow attackers to execute arbitrary code on the server, potentially leading to full system compromise, data theft, or disruption of services. It requires authenticated administrative access with publisher privileges.

Compliance Impact

This vulnerability could lead to unauthorized access, data breaches, or loss of sensitive data, which may violate compliance requirements such as GDPR or HIPAA. Organizations must address this to maintain regulatory compliance.

Mitigation Strategies

Restrict administrative publisher privileges to only necessary users. Implement strict file type validation for uploads. Configure file upload destinations to non-executable directories. Monitor file upload activity for suspicious patterns.

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