CVE-2026-82774: CONPROSYS M2M Gateway OS Command Injection

CVE-2026-82774 Overview

CVE-2026-82774 is an OS command injection vulnerability [CWE-78] affecting Contec CONPROSYS M2M Gateway Series and CONPROSYS M2M Controller Series devices. The flaw stems from improper neutralization of special elements passed to operating system commands. An authenticated attacker who can log in to the product can execute arbitrary OS commands on the underlying system. Because CONPROSYS devices function as industrial machine-to-machine (M2M) gateways and controllers, successful exploitation can compromise operational technology (OT) environments. The vulnerability was published to the National Vulnerability Database on September 14, 2026.

Critical Impact

Authenticated attackers can execute arbitrary operating system commands on affected CONPROSYS M2M devices, potentially compromising the confidentiality, integrity, and availability of connected industrial systems.

Affected Products

• Contec CONPROSYS M2M Gateway Series
• Contec CONPROSYS M2M Controller Series
• Refer to the Contec Security Information Document for specific model and firmware version details

Discovery Timeline

• 2026-09-14 - CVE-2026-82774 published to NVD
• 2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-82774

Vulnerability Analysis

CVE-2026-82774 is classified as an OS Command Injection weakness under [CWE-78]. The affected CONPROSYS M2M Gateway and Controller products fail to properly neutralize special shell metacharacters within input that is passed to operating system commands. An attacker who is authenticated to the product can inject shell syntax such as command separators, subshells, or pipes into a vulnerable parameter. The injected payload executes with the privileges of the process handling the request, which on embedded gateway platforms often equates to elevated or root-level access.

CONPROSYS devices sit at the boundary between IT networks and industrial control equipment, aggregating telemetry and forwarding control commands. Compromise of these devices can therefore serve as a pivot point into downstream OT assets, disrupt data collection, or manipulate control instructions.

Root Cause

The root cause is missing or insufficient input sanitization before user-supplied data is concatenated into an operating system command string. Rather than using parameterized command execution or a strict allowlist, the affected code paths pass tainted input directly to a shell interpreter. This design permits attackers to escape the intended command context and append arbitrary commands of their choosing.

Attack Vector

The attack vector is network-based and requires low-level authenticated access. An attacker must first obtain valid credentials or reuse an existing session to reach the vulnerable interface. Once authenticated, the attacker submits a crafted request containing shell metacharacters to a vulnerable endpoint. Post-exploitation activities can include persistent implant installation, credential harvesting, lateral movement into the OT network, and manipulation of industrial process data. No user interaction is required beyond the initial authenticated request.

No public proof-of-concept exploit is currently listed for CVE-2026-82774, and the vulnerability is not present on the CISA Known Exploited Vulnerabilities catalog. Refer to JVN Security Advisory JVNVU96551518 for additional technical context.

Detection Methods for CVE-2026-82774

Indicators of Compromise

• Unexpected child processes spawned by the CONPROSYS web management or API service, particularly shells such as /bin/sh or /bin/bash.
• Outbound network connections from CONPROSYS devices to unknown IP addresses or on non-standard ports following authenticated HTTP requests.
• Modifications to configuration files, cron entries, or startup scripts on the gateway or controller.
• Authentication log entries showing successful logins from unusual source IPs immediately preceding administrative API calls.

Detection Strategies

• Inspect HTTP and API request parameters for shell metacharacters such as ;, |, &, `, $(, and newline sequences.
• Correlate authenticated session activity with subsequent process execution telemetry on the device management plane.
• Alert on any process execution originating from web server or CGI parent processes on embedded CONPROSYS platforms.

Monitoring Recommendations

• Forward CONPROSYS device logs to a centralized SIEM or data lake for retention and correlation with OT network telemetry.
• Monitor network flow data for anomalous egress from the gateway management VLAN.
• Enable detailed audit logging on the product management interface to capture the full request URI and parameter contents.

How to Mitigate CVE-2026-82774

Immediate Actions Required

• Apply the vendor-supplied firmware update referenced in the Contec Security Information Document.
• Restrict network access to the CONPROSYS management interface to a dedicated administrative network or jump host.
• Rotate all administrative credentials on affected devices and disable any default or shared accounts.
• Audit recent authentication logs for unauthorized access preceding the disclosure date.

Patch Information

Contec has published security guidance for CONPROSYS M2M Gateway Series and CONPROSYS M2M Controller Series. Administrators should consult the Contec Security Information Document and JVN Security Advisory JVNVU96551518 to identify affected firmware versions and obtain the corrected release.

Workarounds

• Place affected devices behind a network firewall that permits management traffic only from approved source addresses.
• Enforce multi-factor authentication or a bastion host in front of the CONPROSYS management interface where the product does not natively support MFA.
• Segment the CONPROSYS device from downstream OT equipment using strict ACLs to limit blast radius if exploitation occurs.
• Disable unused services and remote management features on the device until the patch can be applied.