CVE-2026-6284Network attack vector

Unauthorized access via unlimited password guessing

Published Apr 17, 2026 · Updated Apr 17, 2026

Weak password controls in Horner Automation Cscape 10.0, XL4 PLC 16.32.0, and XL7 PLC 15.60 allow remote attackers to obtain passwords. The authentication flow accepts passwords of limited complexity and applies no delay or attempt limit to repeated network guesses. Network reachability to a PLC is sufficient to enumerate credentials, enabling unauthorized access to protected systems and services.

CVSS severity9.3
Critical
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak password controls in Horner Automation Cscape 10.0, XL4 PLC 16.32.0, and XL7 PLC 15.60 allow remote attackers to obtain passwords. The authentication flow accepts passwords of limited complexity and applies no delay or attempt limit to repeated network guesses. Network reachability to a PLC is sufficient to enumerate credentials, enabling unauthorized access to protected systems and services.

The record

CVE
CVE-2026-6284
Published
Apr 17, 2026
Updated
Apr 17, 2026
Vendor
Horner Automation
Product
XL7 PLC
Classifications
CWE-521, T0806
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=15.60

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Horner Automation · XL7 PLCversion=15.60
Horner Automation · XL4 PLCversion=16.32.0
Horner Automation · Cscapeversion=10.0

Published CVSS scores

9.1CISA ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
9.3CISA ICS-CERTCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-521Weak Password Requirements
T0806Brute Force

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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