---
title: "CVE-2026-41020: Eaton easyE4 - Authentication Bypass"
description: "Eaton easyE4 contains an authentication bypass caused by use of a static nonce during authentication, letting unauthenticated attackers replay captured authentication traffic to gain unauthorized access."
url: https://panop.io/threat-heartbeat/CVE-2026-41020/
---

# CVE-2026-41020 Eaton easyE4 - Authentication Bypass

Eaton easyE4 contains an authentication bypass caused by use of a static nonce during authentication, letting unauthenticated attackers replay captured authentication traffic to gain unauthorized access.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.23% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-41020)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Published

27 October 2026

Updated

29 October 2026

Weakness

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

## Vendor fix

Update to the latest version with improved authentication mechanisms.

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-2026-41020](https://nvd.nist.gov/vuln/detail/CVE-2026-41020)
- [https://www.eaton.com/content/dam/eaton/company/news-insights/cybersecurity/security-bulletins/eaton-va-2026-1017.pdf](https://www.eaton.com/content/dam/eaton/company/news-insights/cybersecurity/security-bulletins/eaton-va-2026-1017.pdf)

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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

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