Auth bypass in Contec Co., Ltd. Remote I/o Coupler Unit (Server Type) Cpsn-Mcb271-*

CVE-2026-82784

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.

Vulnerability class: Broken Authentication

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (27.5th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-82784: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-82784?
CVE-2026-82784 is a medium-severity vulnerability in Contec Co., Ltd. Remote I/o Coupler Unit (Server Type) Cpsn-Mcb271-*, classified under Missing Authentication for Critical Function. CVSS score: 6.5/10. Published 2026-09-14.
How severe is CVE-2026-82784?
Medium severity. CVSS v3 base score is 6.5 out of 10.