---
id: CVE-2026-12655
title: >-
  A security issue exists within 1732E ArmorBlock® I/O, where an unauthenticated
  attacker can change the device's webserver password without valid credentials
summary: >-
  A security issue exists within 1732E ArmorBlock® I/O, where an unauthenticated
  attacker can change the device's webserver password without valid credentials.
  This could result in admin account takeover or unauthorized modification of
  dev…
severity: high
cvss: 8.8
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-294
vendor: Rockwell Automation
product: 1732E ArmorBlock® I/O
affected:
  - 1732e_armorblock_i_o <= 3.012
published: '2026-10-13'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:56:15.773'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-12655'
references:
  - url: >-
      https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1801.html
    label: PSIRT@rockwellautomation.com
tags:
  - nvd
  - cve.org
epss: 0.00269
epssPercentile: 0.18948
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-15T17:32:59.205388Z'
cvssSource: cna
ingestedAt: '2026-10-13T15:33:40.076Z'
---

## Overview

A security issue exists within 1732E ArmorBlock® I/O, where an unauthenticated attacker can change the device's webserver password without valid credentials. This could result in admin account takeover or unauthorized modification of device configuration.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.