CVE-2026-102454 in EasyFlow .NET
Summary
by MITRE • 09/30/2026
EasyFlow .NET developed by Digiwin has an Arbitrary File Upload vulnerability. Privileged remote attackers can upload and execute web shell backdoors, thereby enabling arbitrary code execution on the server.
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Analysis
by VulDB Data Team • 09/30/2026
The software EasyFlow.NET, developed by Digiwin Software Limited, contains a critical security flaw classified as an arbitrary file upload vulnerability. This weakness allows unauthenticated or low-privileged remote attackers to bypass input validation mechanisms and upload malicious files directly onto the application server's filesystem. The core technical issue stems from insufficient verification of uploaded file types, extensions, and content integrity during the ingestion process. By exploiting this lack of sanitization, an attacker can craft a request that includes a script file disguised with a legitimate extension or utilizing double-extension tricks to evade basic detection filters. Once successfully uploaded, these files are often stored in directories accessible by the web server's execution engine, such as ASP.NET handlers for .aspx or .ashx files.
The operational impact of this vulnerability is severe and directly leads to remote code execution on the affected system. When a privileged attacker uploads a web shell backdoor, they gain the ability to execute arbitrary commands within the context of the application pool identity. This typically grants access to sensitive internal data, allows for further lateral movement across the network, or enables complete compromise of the underlying operating system if the service account possesses elevated privileges. The presence of a persistent backdoor facilitates long-term unauthorized access, making it easier for threat actors to maintain their foothold even after initial detection attempts are made by security monitoring tools that do not specifically look for web shell artifacts in upload directories.
From an industry standards perspective, this vulnerability aligns with CWE-434, which describes the unrestricted upload of files with dangerous types. It also maps closely to MITRE ATT&CK technique T1505.002, known as Web Shell: ASPX, where attackers deploy web shells on vulnerable servers to execute commands and maintain persistence. The exploitation path typically involves initial reconnaissance followed by a direct exploit attempt against the file upload endpoint, leveraging the server's configuration to interpret uploaded scripts as executable code rather than static data.
Mitigation strategies must focus on implementing strict allow-listing for permitted file extensions and content types at both the application layer and infrastructure level. Developers should enforce rigorous validation of file contents using magic numbers or MIME type verification rather than relying solely on file extensions, which are easily spoofed. Additionally, uploaded files should be stored in a directory that is not executable by the web server, ensuring that even if malicious scripts are uploaded, they cannot be directly executed via HTTP requests. Implementing Web Application Firewall rules to detect and block common web shell patterns can provide an additional layer of defense. Regular security audits and static code analysis focused on file handling routines are essential to identify and remediate such flaws before deployment in production environments.