CVE-2025-41347 in WinPlus
Summary
by MITRE • 11/18/2025
Unlimited upload vulnerability for dangerous file types in WinPlus v24.11.27 from Informática del Este. This vulnerability allows an attacker to upload a 'webshell' by sending a POST request to '/WinplusPortal/ws/sWinplus.svc/json/uploadfile'.
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Analysis
by VulDB Data Team • 11/20/2025
The vulnerability identified as CVE-2025-41347 represents a critical security flaw in WinPlus v24.11.27, a software solution developed by Informática del Este. This issue manifests as an unlimited file upload capability that permits the ingestion of dangerous file types, creating a significant attack surface for malicious actors. The vulnerability specifically affects the WinPlusPortal web service component, which exposes a JSON upload endpoint at '/WinplusPortal/ws/sWinplus.svc/json/uploadfile' that lacks proper validation mechanisms for file types and content.
The technical implementation of this flaw stems from inadequate input validation and access control measures within the application's file upload functionality. When a POST request is sent to the designated endpoint, the system fails to enforce restrictions on file extensions, MIME types, or content signatures that would normally prevent the upload of executable or malicious files. This absence of proper sanitization creates an unrestricted upload path where attackers can bypass normal security controls and introduce harmful payloads directly into the target system. The vulnerability is classified under CWE-434, which specifically addresses the insecure upload of file content, and aligns with ATT&CK technique T1195.001 related to uploading malicious files for execution.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with a direct pathway to achieve remote code execution within the target environment. Successful exploitation allows malicious actors to upload webshell files that can be executed by the web server, enabling them to gain persistent access to the system and potentially escalate privileges. The unlimited nature of the upload capability means that attackers can repeatedly attempt uploads without encountering rate limiting or other protective measures, making automated exploitation feasible. This vulnerability can lead to complete system compromise, data exfiltration, and the establishment of persistent backdoors that persist across system reboots.
Mitigation strategies for CVE-2025-41347 should prioritize immediate implementation of file type validation and content inspection mechanisms. Organizations must enforce strict file extension filtering, implement MIME type validation, and conduct thorough content analysis to detect potentially malicious file characteristics. The web server configuration should be updated to restrict file upload directories and ensure proper permissions are enforced. Network-based protections such as web application firewalls should be deployed to monitor and block suspicious upload attempts. Additionally, implementing rate limiting and authentication controls for the upload endpoint will significantly reduce the attack surface. Regular security assessments and vulnerability scanning should be conducted to identify similar issues within the application stack, while system administrators should monitor for unusual file upload activities that may indicate exploitation attempts. The remediation process should also include reviewing and updating the application's access control policies to ensure that only authorized users can perform file upload operations.