---
title: "CVE-2026-12655: 1732E ArmorBlock® I/O - Authentication Bypass"
description: "1732E ArmorBlock® I/O contains an authentication bypass caused by lack of credential validation in the webserver password change functionality, letting unauthenticated attackers take over admin accounts or modify device configuration, exploit requires no authentication."
url: https://panop.io/threat-heartbeat/CVE-2026-12655/
---

# CVE-2026-12655 1732E ArmorBlock® I/O - Authentication Bypass

1732E ArmorBlock® I/O contains an authentication bypass caused by lack of credential validation in the webserver password change functionality, letting unauthenticated attackers take over admin accounts or modify device configuration, exploit requires no authentication.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.27% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-12655)

## Details

Type

Authentication Bypass

Impact

Broken Authentication, Broken Access Control

CVSS vector

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

13 October 2026

Updated

15 October 2026

Weakness

[CWE-294](https://cwe.mitre.org/data/definitions/294.html)

## Vendor fix

Update to the latest version with proper authentication validation.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-12655](https://nvd.nist.gov/vuln/detail/CVE-2026-12655)
- [https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1801.html](https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1801.html)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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