CVE-2026-82783

Credential disclosure via plaintext on-device password storage

Published Sep 14, 2026 · Updated Sep 14, 2026

Plaintext password storage in CONTEC CONPROSYS nano devices allows physically proximate attackers to obtain credentials through physical access. The firmware stores passwords in plaintext on the device rather than protecting the stored credential data, but CONTEC does not identify the storage locus or extraction method. Physical access and high attack complexity are required; the reported consequence is credential disclosure with no integrity or availability impact.

CVSS severity4.1
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Plaintext password storage in CONTEC CONPROSYS nano devices allows physically proximate attackers to obtain credentials through physical access. The firmware stores passwords in plaintext on the device rather than protecting the stored credential data, but CONTEC does not identify the storage locus or extraction method. Physical access and high attack complexity are required; the reported consequence is credential disclosure with no integrity or availability impact.

The record

CVE
CVE-2026-82783
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
CONTEC Co., Ltd.
Product
CONPROSYS nano CPSN-PCB271-S1-041 Programmable Remote I/O Communication Coupler
Classifications
CWE-256
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.61

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

CONTEC Co., Ltd. · CONPROSYS nano CPSN-PCB271-S1-041 Programmable Remote I/O Communication Couplerversion=0 <1.61
CONTEC Co., Ltd. · CONPROSYS nano CPSN-MCB271 Remote I/O CPU Unitversion=0 <1.82
CONTEC Co., Ltd. · CONPROSYS nano CPSN-EOB471EI EtherNet/IP Coupler Unitversion=0 <1.02

Published CVSS scores

4.2JPCERT/CCCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
4.1JPCERT/CCCVSS:4.0/AV:P/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-256Plaintext Storage of a Password

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo