CVE-2026-82780 in CONPROSYS TM Series
Summary
by MITRE • 09/14/2026
Unrestricted upload of file with dangerous type issue exists in CONPROSYS TM Series. If a specially crafted file is uploaded by a remote authenticated attacker, an arbitrary command may be executed on the product.
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Analysis
by VulDB Data Team • 09/14/2026
The vulnerability identified within the CONPROSYS TM Series represents a critical security flaw rooted in inadequate input validation during the file upload process. This specific issue allows for the unrestricted upload of files with dangerous or executable types, such as scripts or binaries, rather than restricting uploads to expected data formats like images or configuration documents. The core technical failure lies in the application's inability to properly verify the content type and extension of uploaded files against a strict allowlist. Instead of performing robust server-side validation that checks both file signatures and extensions, the system relies on insufficient checks that can be easily bypassed by an attacker crafting a malicious payload with a deceptive filename or modified header information. This lack of rigorous sanitization creates a direct pathway for code injection into the application's environment.
From an operational perspective, this vulnerability poses a severe risk to the integrity and availability of industrial control systems managed by the CONPROSYS TM Series. Because the flaw permits remote authenticated attackers to execute arbitrary commands on the product, it effectively grants full administrative access to any user account that has been compromised or possesses valid credentials. An attacker could leverage this capability to install backdoors, exfiltrate sensitive operational data, modify process parameters, or disrupt critical industrial processes. The impact extends beyond simple system compromise; in an industrial context, such unauthorized command execution can lead to physical damage to machinery, safety hazards for personnel, and significant downtime due to the need for emergency remediation and system restoration.
This vulnerability aligns with Common Weakness Enumeration (CWE) ID 434, which describes Unrestricted Upload of File with Dangerous Type. It also maps directly to MITRE ATT&CK technique T1505.003, known as Web Shell: ASPX, indicating that the uploaded file likely functions as a web shell or similar executable script designed to maintain persistent access and facilitate further lateral movement within the network infrastructure. The presence of authentication requirements means this is not an unauthenticated remote code execution flaw but rather an abuse of legitimate user privileges, highlighting the importance of implementing role-based access controls and principle of least privilege even for authenticated users interacting with file upload functionalities.
To mitigate this risk, immediate remediation efforts should focus on enforcing strict server-side validation mechanisms. Developers must implement a whitelist approach that only permits specific, safe file extensions relevant to the application's intended function. Additionally, content-type verification using MIME type detection and magic number analysis is essential to ensure the uploaded data matches its declared format. Files should be stored in directories with execute permissions disabled, and filenames should be randomized or sanitized to prevent directory traversal attacks. Implementing these controls will significantly reduce the attack surface associated with file upload features and protect industrial environments from potential exploitation of this critical vulnerability.