CVE-2026-82780: CONPROSYS TM Series RCE Vulnerability

CVE-2026-82780 Overview

CVE-2026-82780 is an unrestricted file upload vulnerability affecting the Contec CONPROSYS TM Series. The flaw allows a remote authenticated attacker to upload a specially crafted file with a dangerous type. Successful exploitation results in arbitrary command execution on the affected device. The weakness is classified under CWE-434: Unrestricted Upload of File with Dangerous Type.

CONPROSYS TM Series devices are industrial monitoring and control products commonly deployed in operational technology (OT) environments. Compromise of these devices can extend an attacker's foothold into process control networks.

Critical Impact

Authenticated attackers can execute arbitrary commands on affected CONPROSYS TM Series devices by uploading a malicious file over the network, resulting in full loss of confidentiality, integrity, and availability on the product.

Affected Products

• Contec CONPROSYS TM Series (see vendor advisory for specific model and firmware versions)
• Refer to the Contec Security Information Document for the authoritative affected-version list
• Refer to the JVN Security Advisory for coordinated disclosure details

Discovery Timeline

• 2026-09-14 - CVE-2026-82780 published to NVD
• 2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-82780

Vulnerability Analysis

The vulnerability is an unrestricted file upload flaw in the CONPROSYS TM Series firmware. The product accepts file uploads from authenticated users without adequately validating the file type, extension, or content. An attacker who supplies valid credentials can therefore place executable content on the device.

Because the uploaded file is subsequently processed or invoked by the product, the attacker gains the ability to execute arbitrary operating system commands in the context of the underlying service. The attack is executed over the network and requires low privileges and no user interaction.

Root Cause

The root cause is missing or insufficient validation on the file upload interface, aligning with CWE-434. The application does not enforce an allowlist of safe file types, does not verify MIME type against actual file contents, and does not restrict where uploaded files may be written or executed on the device.

Attack Vector

Exploitation requires network access to the device's management interface and valid low-privilege credentials. An authenticated attacker submits a crafted file, such as a script or executable payload, through the upload functionality. The device stores the file in a location where it can be invoked, and the attacker triggers execution to run arbitrary commands.

No verified proof-of-concept code is publicly available. Refer to the JVN Security Advisory and the Contec Security Information Document for vendor-provided technical details.

Detection Methods for CVE-2026-82780

Indicators of Compromise

• Unexpected files (scripts, binaries, archives, or web shells) present in upload or web-accessible directories on the device.
• HTTP POST requests to the CONPROSYS upload endpoints originating from unusual source addresses or at unusual times.
• Child processes spawned by the CONPROSYS service that invoke shell interpreters or system utilities inconsistent with normal operation.
• Outbound network connections from the device to unknown external hosts following an upload event.

Detection Strategies

• Inspect web server and application logs for authenticated upload requests, correlating file names and extensions against an allowlist of expected values.
• Monitor filesystem integrity on the device for the creation or modification of files in upload directories outside maintenance windows.
• Alert on process execution chains where the CONPROSYS service spawns command interpreters or network utilities.

Monitoring Recommendations

• Enable and centralize logging from CONPROSYS TM Series devices to a SIEM for retention and correlation.
• Baseline normal administrative activity, including expected upload sources, times, and account usage, and alert on deviations.
• Segment OT networks and monitor north-south traffic to the device management interface for anomalous access patterns.

How to Mitigate CVE-2026-82780

Immediate Actions Required

• Apply the vendor-supplied firmware update referenced in the Contec Security Information Document as soon as it is available for your model.
• Restrict network access to the device management interface to trusted administrative hosts only.
• Rotate credentials for all accounts on affected devices and enforce strong, unique passwords.
• Audit upload directories on affected devices for unauthorized files and remove any that are not expected.

Patch Information

Contec has published a security information document for this issue. Consult the Contec Security Information Document and the coordinated JVN Security Advisory for the specific firmware versions that remediate CVE-2026-82780 and for vendor-recommended update procedures.

Workarounds

• Place affected devices behind a firewall or VPN and block direct access from untrusted networks.
• Disable or restrict the file upload functionality where operationally feasible until a patch is applied.
• Limit the number of accounts with upload privileges and remove unused accounts.
• Apply network segmentation between IT and OT environments in line with IEC 62443 guidance.