CVE-2026-92532 in BugTracker.NET
Summary
by MITRE • 10/07/2026
Unrestricted file upload vulnerability in the BugTracker.NET attachment functionality. An authenticated user with administrator privileges could modify the application configuration to store files in a directory accessible via the web interface. Due to the lack of proper file extension validation, an attacker could upload a malicious ASPX file and subsequently execute it on the server. A successful exploit could allow arbitrary code execution with the privileges of the account used by the web service.
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified in BugTracker.NET represents a critical security flaw within its attachment handling subsystem, specifically stemming from an unrestricted file upload mechanism combined with misconfigured application settings. This issue arises when an authenticated user possessing administrator-level privileges alters the application configuration to designate a directory that is directly accessible via the web interface as the storage location for uploaded files. In standard secure architectures, directories intended for storing user-uploaded content should be isolated from direct execution by the web server or placed outside the document root entirely. By allowing administrators to point this setting toward a web-accessible path, the application inadvertently creates an attack vector where any file stored in that directory can be requested and processed directly through HTTP requests.
The core technical flaw lies in the absence of rigorous input validation regarding file extensions during the upload process. The system fails to enforce strict allow-lists or perform deep content inspection on files being uploaded by privileged users. Consequently, an attacker who has compromised administrative credentials or exploits a privilege escalation vulnerability can bypass standard security controls. By uploading a malicious ASPX file, which is a server-side script format executable by Internet Information Services (IIS) and other .NET-enabled web servers, the attacker places executable code directly into a location where it can be invoked via a URL request. The lack of extension validation ensures that the system does not reject non-standard or dangerous file types, treating them with the same trust as legitimate attachments like PDFs or images.
The operational impact of this vulnerability is severe, leading to remote arbitrary code execution on the target server. Once the malicious ASPX file is uploaded and accessed via its URL, the web server processes it using the application pool identity or service account privileges associated with BugTracker.NET. This results in full control over the underlying operating system context under which the web application runs. An attacker can leverage this access to exfiltrate sensitive data stored within the database, modify application configurations further, pivot to other systems on the internal network, or establish persistent backdoors for long-term unauthorized access. The severity is amplified by the fact that it requires initial administrative authentication, meaning it often serves as a post-exploitation step following credential theft or social engineering attacks against high-privilege accounts.
From an industry standards perspective, this vulnerability aligns with CWE-434, which describes Unrestricted Upload of File with Dangerous Type, and CWE-264, involving Permissions, Privileges, and Access Controls where the user has excessive privileges that lead to security weaknesses. In terms of offensive tactics, this scenario maps directly to MITRE ATT&CK technique T1505.003, Server Software Component: Web Shell, which details how attackers install web shells for persistent access. It also relates to T1078, Valid Accounts, as the exploit relies on legitimate administrative credentials being compromised or abused.
Mitigation strategies must address both the configuration management and input validation aspects of this flaw. First, administrators should ensure that directories used for storing uploaded files are located outside the web server's document root or configured with strict execution permissions disabled via IIS settings such as removing execute rights from specific folders. Second, the application code should be patched to enforce a strict allow-list of permitted file extensions regardless of user role, ensuring that even administrators cannot bypass these restrictions through configuration changes unless explicitly intended for safe content types like images and documents. Additionally implementing multi-factor authentication for administrative accounts reduces the risk of initial credential compromise, while regular security audits can detect misconfigurations where upload directories are inadvertently exposed to public web access.