Welker OdorEyes EcoSystem Pulse Bypass System with XL4 Controller

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Summary
Successful exploitation of this vulnerability could result in an over- or under-odorization event.
The following versions of Welker OdorEyes EcoSystem Pulse Bypass System with XL4 Controller are affected:

OdorEyes EcoSystem Pulse Bypass System with XL4 Controller vers:all/* (CVE-2026-24790)

CVSS
Vendor
Equipment
Vulnerabilities

v3 8.2
Welker
Welker OdorEyes EcoSystem Pulse Bypass System with XL4 Controller
Missing Authentication for Critical Function

Background

Critical Infrastructure Sectors: Chemical, Critical Manufacturing, Energy, Food and Agriculture
Countries/Areas Deployed: Worldwide
Company Headquarters Location: United States

Vulnerabilities

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CVE-2026-24790

The underlying PLC of the device can be remotely influenced, without proper safeguards or authentication.
View CVE Details

Affected Products
Welker OdorEyes EcoSystem Pulse Bypass System with XL4 Controller

Vendor:Welker
Product Version:Welker OdorEyes EcoSystem Pulse Bypass System with XL4 Controller: vers:all/*
Product Status:known_affected

Remediations
MitigationWelker did not respond to CISA's attempts at coordination. Users of Welker OdorEyes devices are encouraged to contact Welker and keep their systems up to date.

Relevant CWE: CWE-306 Missing Authentication for Critical Function

Metrics

CVSS Version
Base Score
Base Severity
Vector String

3.1
8.2
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

Acknowledgments

A project sponsored by DHS S&T reported this vulnerability to CISA

Legal Notice and Terms of Use
This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).

Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as:
Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
Locate control system networks and remote devices behind firewalls and isolating them from business networks.
When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.

Revision History

Initial Release Date: 2026-02-19

Date
Revision
Summary

2026-02-19
1
Initial Publication

Legal Notice and Terms of Use

Source: https://www.cisa.gov/news-events/ics-advisories/icsa-26-050-04