CVE-2025-6873 in Simple Company Website
Summary
by MITRE • 06/30/2025
A vulnerability, which was classified as critical, has been found in SourceCodester Simple Company Website 1.0. This issue affects some unknown processing of the file /classes/Users.php?f=save. The manipulation of the argument img leads to unrestricted upload. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 06/30/2025
This critical vulnerability in SourceCodester Simple Company Website version 1.0 represents a severe security flaw that allows remote attackers to execute unrestricted file uploads through the /classes/Users.php?f=save endpoint. The vulnerability specifically manifests when processing the img parameter, which lacks proper validation mechanisms for file type and content verification. This weakness enables attackers to upload malicious files including web shells, malware, or other harmful executables that can compromise the entire web application infrastructure.
The technical implementation of this vulnerability stems from insufficient input sanitization and file validation within the Users.php class. When the img parameter is processed, the application fails to enforce strict file type restrictions, content checks, or secure storage mechanisms for uploaded files. This flaw aligns with CWE-434, which addresses insecure file upload vulnerabilities where applications accept files without proper validation, allowing attackers to upload malicious content. The vulnerability's classification as critical reflects the potential for complete system compromise through unrestricted file upload capabilities.
Operationally, this vulnerability presents significant risks to organizations using the Simple Company Website platform. Remote exploitation allows attackers to bypass authentication mechanisms and directly upload malicious payloads to the server. Once successful, attackers can establish persistent backdoors, execute arbitrary code, steal sensitive data, or use the compromised system as a launch point for further attacks within the network. The public disclosure of the exploit increases the likelihood of widespread exploitation, as threat actors can readily implement the attack without requiring advanced technical skills or custom development.
The impact extends beyond immediate system compromise to include potential data breaches, service disruption, and regulatory compliance violations. Organizations may face legal consequences and financial losses due to unauthorized access to sensitive company information or customer data stored on the compromised platform. The vulnerability also creates opportunities for attackers to use the compromised system for botnet activities, spam distribution, or as a pivot point for attacking other systems within the organization's network infrastructure.
Mitigation strategies should focus on implementing comprehensive input validation and file type restriction mechanisms. Organizations must immediately patch the application to validate file extensions, check MIME types, and perform content analysis of uploaded files. Implementing secure file storage practices including proper file naming conventions, restricted file permissions, and separate storage locations for uploads can significantly reduce exploitation risks. Network segmentation and intrusion detection systems should be deployed to monitor for suspicious file upload activities. Additionally, regular security audits and vulnerability assessments should be conducted to identify similar weaknesses in other application components. The ATT&CK framework categorizes this vulnerability under T1190 - Exploit Public-Facing Application, highlighting the need for proper application hardening and regular security maintenance to prevent such exploitation scenarios.