CVE-2026-82781Network attack vector

Browser script execution via settings-screen input

Published Sep 14, 2026 · Updated Sep 14, 2026

Cross-site scripting in CONTEC CONPROSYS nano firmware allows remote authenticated users to execute arbitrary scripts in a logged-in user's browser. The settings screen fails to neutralize attacker-controlled input before browser rendering; CONTEC has not disclosed the affected parameter or handler. Exploitation requires low-privileged settings access and user interaction, and the resulting script can redirect the logged-in user to an unauthorized site.

CVSS severity5.1
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in CONTEC CONPROSYS nano firmware allows remote authenticated users to execute arbitrary scripts in a logged-in user's browser. The settings screen fails to neutralize attacker-controlled input before browser rendering; CONTEC has not disclosed the affected parameter or handler. Exploitation requires low-privileged settings access and user interaction, and the resulting script can redirect the logged-in user to an unauthorized site.

The record

CVE
CVE-2026-82781
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-79, T1203
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 <1.61

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

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

5.1JPCERT/CCCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
5.4JPCERT/CCCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4CONTEC Co., Ltd.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A: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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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

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Your stack

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