CVE-2026-82786Network attack vector

Credential disclosure via inadequately protected backup files

Published Sep 14, 2026 · Updated Sep 14, 2026

Insufficient credential protection in CONTEC CPSN-MCB271 firmware before 1.82 allows remote authenticated users to recover secrets from backups. Configuration backup files store MQTT and REST API credentials in a form that remains recoverable instead of adequately protecting the secrets. Low-privilege network access is required, and successful exploitation discloses credentials without reported data modification or service interruption.

CVSS severity8.2
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient credential protection in CONTEC CPSN-MCB271 firmware before 1.82 allows remote authenticated users to recover secrets from backups. Configuration backup files store MQTT and REST API credentials in a form that remains recoverable instead of adequately protecting the secrets. Low-privilege network access is required, and successful exploitation discloses credentials without reported data modification or service interruption.

The record

CVE
CVE-2026-82786
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
CONTEC Co., Ltd.
Product
CONPROSYS nano CPSN-MCB271 Remote I/O Coupler Unit (Server Type)
Classifications
CWE-522, T1555
Attack vector
network
Privileges
authenticated

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

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <1.82

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

CONTEC Co., Ltd. · CONPROSYS nano CPSN-MCB271 Remote I/O Coupler Unit (Server Type)version=0 <1.82

Published CVSS scores

6.3CONTEC Co., Ltd.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
8.2JPCERT/CCCVSS:4.0/AV:N/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.

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No observations available

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

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1555Credentials from Password Stores

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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