CVE-2026-57311: CWE-434 Unrestricted Upload of File with Dangerous Type in JCD Windu CMS
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.
AI Analysis
Technical Summary
CVE-2026-57311 describes a CWE-434 vulnerability in Windu CMS version 4.1 where the system fails to validate the types of uploaded files. An authenticated attacker can upload arbitrary files, including potentially malicious PHP scripts, which may result in remote code execution. Attempts to contact the vendor for remediation have been unsuccessful, and no official fix or patch is currently available.
Potential Impact
An authenticated attacker can upload arbitrary files without restriction, including executable PHP files, which can lead to remote code execution on the affected system. This compromises the confidentiality, integrity, and availability of the system running Windu CMS 4.1.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict file upload permissions to trusted users only and consider implementing external file type validation or sandboxing measures to mitigate risk.
CVE-2026-57311: CWE-434 Unrestricted Upload of File with Dangerous Type in JCD Windu CMS
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.
CVSS v4.0
Score 5.3medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-57311 describes a CWE-434 vulnerability in Windu CMS version 4.1 where the system fails to validate the types of uploaded files. An authenticated attacker can upload arbitrary files, including potentially malicious PHP scripts, which may result in remote code execution. Attempts to contact the vendor for remediation have been unsuccessful, and no official fix or patch is currently available.
Potential Impact
An authenticated attacker can upload arbitrary files without restriction, including executable PHP files, which can lead to remote code execution on the affected system. This compromises the confidentiality, integrity, and availability of the system running Windu CMS 4.1.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict file upload permissions to trusted users only and consider implementing external file type validation or sandboxing measures to mitigate risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CERT-PL
- Date Reserved
- 2026-06-24T12:12:42.195Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a5e1eb32a4a8d59891652c8
Added to database: 07/20/2026, 13:12:19 UTC
Last enriched: 07/20/2026, 13:27:09 UTC
Last updated: 07/21/2026, 07:28:25 UTC
Views: 18
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