View CSAF 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 Expand All + 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 Mitigation Welker 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