CVE-2026-66665 in Type Hub Plugin
Summary
by MITRE • 08/06/2026
Unauthenticated Arbitrary File Upload in Type Hub <= 2.0.6 versions.
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Analysis
by VulDB Data Team • 08/06/2026
This vulnerability represents a critical security flaw in the Type Hub content management system affecting versions 2.0.6 and earlier, where unauthenticated users can upload arbitrary files to the server without proper authorization checks. The technical implementation allows attackers to bypass authentication mechanisms and directly upload malicious files to the application's file upload functionality, creating a persistent threat vector for remote code execution and system compromise.
The underlying flaw stems from insufficient input validation and access control measures within the file upload handler, which fails to properly verify user credentials or restrict file types based on security policies. This vulnerability directly maps to CWE-434 Unrestricted Upload of File with Dangerous Type, a well-documented weakness in web application security that enables attackers to upload executable scripts or malicious binaries that can be executed by the web server. The absence of proper file type validation, size restrictions, and authentication checks creates an exploitable entry point for threat actors seeking to establish persistent access to the compromised system.
The operational impact of this vulnerability extends beyond simple unauthorized file uploads, as it provides attackers with the capability to execute arbitrary code on the target server. Once an attacker successfully uploads a malicious file, they can leverage this access to perform various malicious activities including data exfiltration, privilege escalation, and establishing backdoors for continued access. The vulnerability affects the confidentiality, integrity, and availability of the affected system, potentially leading to complete system compromise and unauthorized access to sensitive data stored within the Type Hub environment.
Security practitioners should implement immediate mitigations including restricting file upload functionality to authenticated users only, implementing strict file type validation with whitelisting approaches, and configuring proper access controls around upload directories. The vulnerability aligns with several ATT&CK techniques including T1566.001 Initial Access: Phishing and T1059.001 Command and Scripting Interpreter, as attackers can use this vector to establish initial footholds and execute malicious payloads. Organizations should also consider implementing web application firewalls to detect and block suspicious upload attempts, while ensuring proper logging and monitoring of file upload activities to identify potential exploitation attempts.
The broader implications of this vulnerability highlight the importance of secure coding practices and proper authentication mechanisms in web applications. Regular security assessments and code reviews should focus on identifying similar authorization bypass issues, particularly in file handling components and user access controls. Additionally, maintaining up-to-date software versions and implementing defense-in-depth strategies including network segmentation and privileged access management can significantly reduce the risk exposure associated with such vulnerabilities. The vulnerability demonstrates how seemingly simple functionality like file uploads can become critical attack vectors when proper security controls are not implemented.