CVE-2026-53691 in Redeight
Summary
by MITRE • 06/30/2026
An Unrestricted File Upload vulnerability in Redeight CMS version 1.0 allows authenticated attackers to achieve Remote Code Execution via the POST "/admin/index.php?module=pages&mode=FileAdd" endpoint. The application fails to validate file extensions and MIME types, permitting the upload of arbitrary PHP scripts to the publicly accessible "/uploads/files/" directory where they can be executed directly by the web server.
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Analysis
by VulDB Data Team • 06/30/2026
The vulnerability under examination represents a critical security flaw in Redeight CMS version 1.0 that stems from inadequate input validation mechanisms within the file upload functionality. This issue manifests through an unrestricted file upload condition that occurs when authenticated users interact with the administrative interface, specifically targeting the POST endpoint at "/admin/index.php?module=pages&mode=FileAdd". The flaw exposes a fundamental weakness in the application's security architecture where proper sanitization and validation checks are entirely absent from the file handling process. According to CWE-434, this vulnerability falls under the category of Unrestricted Upload of File with Dangerous Type, which is classified as a high-risk security issue that can lead to complete system compromise.
The technical implementation of this vulnerability exploits the absence of proper file extension and MIME type validation within the application's upload handler. Attackers can bypass all security restrictions by uploading malicious PHP scripts directly to the publicly accessible "/uploads/files/" directory without any verification of the uploaded content's legitimacy or safety. This lack of validation creates a direct path for arbitrary code execution since the web server treats the uploaded files as executable content rather than merely stored documents. The vulnerability is particularly dangerous because it requires only authenticated access, meaning that an attacker who has obtained valid user credentials can leverage this weakness to execute malicious code on the target system.
The operational impact of this vulnerability extends far beyond simple unauthorized file storage since it enables complete remote code execution capabilities. Once a malicious PHP script is uploaded and executed, attackers can perform various malicious activities including data exfiltration, privilege escalation, system reconnaissance, and establishment of persistent backdoors. The publicly accessible nature of the upload directory means that any successful exploitation immediately provides an attacker with a direct execution channel without requiring additional network traversal or complex attack vectors. This vulnerability effectively neutralizes any authentication-based security controls within the CMS and transforms legitimate administrative access into a weaponized attack surface that can be leveraged for comprehensive system compromise.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements to prevent similar issues from occurring in the future. The most critical immediate action involves implementing strict file type validation that checks both file extensions and MIME types against a whitelist of approved content types, ensuring that only safe file formats can be uploaded through the administrative interface. Additionally, uploaded files should be stored outside the web root directory or at minimum execute with restricted permissions that prevent direct web execution. According to ATT&CK framework technique T1059.007, this vulnerability maps directly to remote code execution capabilities that attackers can leverage for persistence and privilege escalation. Organizations should also implement proper access controls and monitoring of file upload activities to detect anomalous behavior that may indicate exploitation attempts, while ensuring that all user sessions are properly validated and secured against session hijacking attacks.