---
id: CVE-2026-82784
title: >-
  Missing authentication for critical function vulnerability exists in Remote
  I/O Coupler Unit (Server Type) CPSN-MCB271-*
summary: >-
  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 an…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-306
vendor: 'Contec Co., Ltd.'
product: Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*
affected:
  - remote_i_o_coupler_unit_server_type_cpsn-mcb271- < 1.82
published: '2026-09-14'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:27:25.623'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82784'
references:
  - url: 'https://jvn.jp/en/vu/JVNVU96551518/'
    label: vultures@jpcert.or.jp
  - url: >-
      https://www.contec.com/api/downloadlogger?download=/-/media/Contec/support/security-info/2026/contec_security_cps_26091000_en.pdf
    label: vultures@jpcert.or.jp
tags:
  - nvd
  - cve.org
epss: 0.00341
epssPercentile: 0.24869
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-14T11:05:59.317623Z'
ingestedAt: '2026-09-14T15:23:07.462Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.