What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-17 · updated 2026-10-25
• Weakness: CWE-521

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.

Affected products

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

References

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

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