CVE-2026-82784
Received Received - Intake

Remote I/O Coupler REST API Authentication Bypass

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: JPCERT/CC

Description
Missing authentication for critical function vulnerability exists in Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*. An attacker may execute a REST API without authentication, which could allow the attacker to retrieve I/O values and/or control the output.

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Meta Information

Published
2026-09-14
Last Modified
2026-09-14
Generated
2026-09-14
AI Q&A
2026-09-14
EPSS Evaluated
N/A
NVD
CVE-2026-82784
EUVD
EUVD-2026-77237

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

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Executive Summary

This vulnerability is a missing authentication issue in the Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*. It allows an attacker to execute a REST API without authentication, potentially retrieving I/O values or controlling outputs.

Detection Guidance

Check for unauthenticated REST API endpoints on the Remote I/O Coupler Unit (CPSN-MCB271-*). Use network scanning tools like nmap to identify open ports and services. Look for HTTP requests to the device without requiring credentials.

Impact Analysis

An attacker could exploit this to read sensitive I/O data or manipulate system outputs, leading to unauthorized control of connected devices or data breaches.

Compliance Impact

This vulnerability could violate compliance requirements by enabling unauthorized access to sensitive data or systems, potentially leading to legal penalties under GDPR or HIPAA.

Mitigation Strategies

Immediately restrict network access to the device using firewalls or VLAN segmentation. Update the device firmware if a patch is available. Implement strong authentication for all REST API endpoints.

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