# CVE-2026-12655: Rockwell Automation 1732E ArmorBlock authentication bypass

Source: https://junglewise.ai/threats/cve-2026-12655-a-security-issue-exists-within-1732e-armorblock-i-o-where-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-12655 · Severity: info · Published 2026-10-13

The 1732E ArmorBlock I/O is an industrial control device that manages digital and analog inputs/outputs on factory floors. An unauthenticated attacker can bypass authentication to change the device's webserver password, leading to complete admin account takeover and unauthorized reconfiguration of critical factory equipment.

Vendors: [Rockwell Automation](https://junglewise.ai/threats/vendors/rockwell-automation).

## Quick answers

**Is CVE-2026-12655 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-12655 being exploited in the wild.

**How severe is CVE-2026-12655?** Informational severity, published 13 October 2026.

**Which products and versions are affected?** Rockwell Automation 1732E ArmorBlock I/O 3.012 and earlier.

**Is there a fix for CVE-2026-12655?** Yes: fixed in 3.013. Until then: Customers unable to upgrade should follow Rockwell Automation security best practices, which typically include network segmentation to restrict access to the device's webserver and disabling unnecessary network services. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-12655 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-12655?** Check whether you run Rockwell Automation 1732E ArmorBlock I/O at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 3.013

Customers unable to upgrade should follow Rockwell Automation security best practices, which typically include network segmentation to restrict access to the device's webserver and disabling unnecessary network services.

## Technical details

The vulnerability allows unauthenticated attackers to change the webserver password through an authentication bypass mechanism (CWE-294: capture-replay), likely in the device's HTTP API. This requires only network access to the device's webserver and no valid credentials. A successful exploit results in admin account compromise and ability to modify device configuration.

## Affected products

- Rockwell Automation 1732E ArmorBlock I/O 3.012 and earlier

## Timeline

- 2026-10-13: advisory

## References

- [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)

## Related threats

- [Rockwell Automation 1732E ArmorBlock denial of service in network storm handling](https://junglewise.ai/threats/cve-2026-12656-a-denial-of-service-security-issue-exists-in-the-affected-product)