CVE record · CVE-2026-82783

Plaintext password storage in Contec Co., Ltd. Remote I/O Coupler Unit (Server Type) CPSN-MCB271-* and others

CVSS 4.1 MediumEPSS 0.0018 · 7th percentile

Published by the CVE Program (CNA: jpcert) at 14 Sept 2026, 06:42 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Contec Co., Ltd.	Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*	affected before 1.82 semver Other versions: unaffected
Contec Co., Ltd.	Remote I/O Coupler Unit (EtherNet/IP Adapter) CPSN-EOB471EI-[]1	affected before 1.02 semver Other versions: unaffected
Contec Co., Ltd.	Programmable Remote I/O Coupler Unit (Software PLC Type) CPSN-PCB271-S1-041	affected before 1.61 semver Other versions: unaffected

Identifiers: CVE-2026-82783
CNA: jpcert
Weakness (CWE): CWE-256
Tags: Contec Co., Ltd. Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*
Contec Co., Ltd. Remote I/O Coupler Unit (EtherNet/IP Adapter) CPSN-EOB471EI-[]1
Contec Co., Ltd. Programmable Remote I/O Coupler Unit (Software PLC Type) CPSN-PCB271-S1-041
CWE-256
Published: 14 Sept 2026
Updated: 14 Sept 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
4.2	Medium	3.1	CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N	CNA (jpcert)
4.1	Medium	4.0	CVSS:4.0/AV:P/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	CNA (jpcert)Used for this record

CISA KEV Not listed.
EPSS 0.0018, the 7th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 14 Sept 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.