CVE-2026-82784

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-14 · updated 2026-09-16
Weakness: CWE-306

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.

Affected products

Contec Co., Ltd. Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*: before 1.82 — fixed in 1.82

How to fix

Upgrade to a fixed version: Contec Co., Ltd. Remote I/O Coupler Unit (Server Type) CPSN-MCB271-* 1.82. Check the vendor advisory for mitigations.

References

https://jvn.jp/en/vu/JVNVU96551518/
https://www.contec.com/api/downloadlogger?download=/-/media/Contec/support/security-info/2026/contec_security_cps_26091000_en.pdf

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