CVE-2026-57311
Received Received - Intake

Windu CMS Remote Code Execution via Arbitrary File Upload

Publication date: 2026-07-20

Last updated on: 2026-07-20

Assigner: CERT.PL

Description
Windu CMS does not validate types of uploaded files. An authenticated attacker can upload arbitrary files, including PHP. This can lead to Remote Code Execution. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 4.1 but may also affect other versions.

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Meta Information

Published
2026-07-20
Last Modified
2026-07-20
Generated
2026-07-21
AI Q&A
2026-07-20
EPSS Evaluated
N/A
NVD
CVE-2026-57311
EUVD
EUVD-2026-45945

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
windu cms From 4.1 (exc)

Helpful Resources

Exploitability

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

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Executive Summary

Windu CMS does not validate file types during upload. An authenticated attacker can upload malicious files, including PHP scripts, which may lead to remote code execution on the server.

Detection Guidance

Check for unexpected PHP or executable files in upload directories. Review server logs for unusual file uploads or access patterns. Look for files with double extensions like .php.jpg or .php5.

Impact Analysis

An attacker could gain control of the server by executing uploaded malicious files. This may result in data theft, unauthorized access, or disruption of services.

Compliance Impact

This vulnerability could lead to unauthorized data access or breaches, violating GDPR and HIPAA requirements for data protection and security.

Mitigation Strategies

Disable file uploads if not required. Implement strict file type validation to block PHP and executable files. Restrict upload directories to prevent execution of uploaded files.

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