CVE-2026-24790Network attack vector

Unauthenticated remote PLC control

Published Feb 20, 2026 · Updated Feb 20, 2026

Missing authentication in all Welker OdorEyes ECOsystem Pulse Bypass systems with XL4 Controller allows remote attackers to alter PLC control. CISA identifies the underlying PLC as remotely influenceable without safeguards or authentication but does not disclose the network service or command path that accepts unauthenticated control input. Network reachability to the controller is sufficient, and successful exploitation can cause over- or under-odorization.

CVSS severity8.2
High
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

Missing authentication in all Welker OdorEyes ECOsystem Pulse Bypass systems with XL4 Controller allows remote attackers to alter PLC control. CISA identifies the underlying PLC as remotely influenceable without safeguards or authentication but does not disclose the network service or command path that accepts unauthenticated control input. Network reachability to the controller is sufficient, and successful exploitation can cause over- or under-odorization.

The record

CVE
CVE-2026-24790
Published
Feb 20, 2026
Updated
Feb 20, 2026
Vendor
Welker, Inc.
Product
OdorEyes ECOsystem Pulse Bypass System with XL4 Controller
Classifications
CWE-306
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 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?

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  1. Affected versionversion=All versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Welker, Inc. · OdorEyes ECOsystem Pulse Bypass System with XL4 Controllerversion=All versions

Published CVSS scores

8.2CISA ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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