CVE-2026-39770 in Doctreat Plugin
Summary
by MITRE • 10/06/2026
Unauthenticated Arbitrary File Upload in Doctreat <= 1.7.0 versions.
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Analysis
by VulDB Data Team • 10/06/2026
The vulnerability identified as an unauthenticated arbitrary file upload flaw within Doctreat versions up to and including 1.7.0 represents a critical security failure that allows attackers to bypass authentication mechanisms entirely. This type of vulnerability is fundamentally rooted in the application's inability to properly validate, sanitize, or restrict user-supplied input when handling file uploads. In many web applications, particularly those built on frameworks like WordPress which Doctreat utilizes as a plugin, file upload functionality must be meticulously secured to prevent malicious actors from injecting executable code onto the server. The absence of authentication checks for this specific endpoint means that any individual with network access to the target system can initiate an upload without providing valid credentials, significantly lowering the barrier to entry for exploitation and expanding the potential attack surface to include untrusted internet users rather than just authenticated administrators or registered patients.
From a technical perspective, the core flaw likely involves insufficient validation of file extensions, MIME types, or content inspection during the upload process. Attackers can exploit this by crafting malicious files that appear benign but contain executable code, such as PHP web shells. By uploading these scripts to directories where they are accessible via HTTP requests, an attacker gains the ability to execute arbitrary commands on the underlying server operating system. This is often facilitated by weak configuration settings in the web server or application logic that fails to distinguish between legitimate medical documents and malicious payloads. The vulnerability aligns closely with CWE-434, which describes the unrestricted upload of files with dangerous types, a common issue in content management systems where user-generated content is processed without rigorous security controls.
The operational impact of this vulnerability is severe, as it typically leads to full system compromise. Once an attacker successfully uploads and executes a web shell, they can interact with the server's file system, database, and network interfaces directly. This enables data exfiltration, where sensitive patient health information protected under regulations like HIPAA or GDPR could be stolen, leading to significant legal and reputational consequences for healthcare providers using the software. Furthermore, attackers may use the compromised server as a pivot point to launch further attacks against internal networks, install ransomware, or create persistent backdoors that are difficult to detect and remove. The lack of authentication makes this vulnerability particularly dangerous because it can be automated at scale by threat actors scanning the internet for vulnerable instances using tools like Shodan or Censys.
To mitigate this risk, immediate action is required from system administrators and developers. The primary recommendation is to upgrade Doctreat to a version later than 1.7.0 where these security flaws have been addressed by the vendor. If upgrading is not immediately possible, temporary mitigations should include restricting file upload permissions at the web server level, ensuring that uploaded files are stored in directories with execute permissions disabled for PHP or other scripting languages. Additionally, implementing strict allowlists for permitted file extensions and utilizing content-type validation on both the client and server sides can help prevent malicious uploads. It is also advisable to deploy a Web Application Firewall configured to detect patterns associated with common web shell uploads and to monitor server logs for unusual upload activity from unauthenticated sources. This vulnerability maps to MITRE ATT&CK technique T1505, specifically Server Software Component: Web Shell, highlighting the critical need for robust input validation and access control in healthcare software ecosystems.