Pharos Controls Mosaic Show Controller

Summary

CISA published advisory ICSA-26-083-01 disclosing CVE-2026-2417, a critical missing authentication vulnerability in Pharos Controls Mosaic Show Controller firmware version 2.15.3 that allows unauthenticated remote attackers to execute arbitrary commands with root privileges. The flaw affects commercial facilities worldwide and carries a CVSS 3.1 base score of 9.8. Pharos Controls recommends immediate upgrade to firmware version 2.16 or later; no public exploitation has been reported at the time of advisory release.

Full text

ICS Advisory Pharos Controls Mosaic Show Controller Release DateMarch 24, 2026 Alert CodeICSA-26-083-01 Related topics: Industrial Control System Vulnerabilities, Industrial Control Systems View CSAF Summary Successful exploitation of this vulnerability could allow an unauthenticated attacker to execute arbitrary commands with root privileges. The following versions of Pharos Controls Mosaic Show Controller are affected: Mosaic Show Controller Firmware 2.15.3 (CVE-2026-2417) CVSS Vendor Equipment Vulnerabilities v3 9.8 Pharos Controls Pharos Controls Mosaic Show Controller Missing Authentication for Critical Function Background Critical Infrastructure Sectors: Commercial Facilities Countries/Areas Deployed: Worldwide Company Headquarters Location: United Kingdom Vulnerabilities Expand All + CVE-2026-2417 A Missing Authentication for Critical Function vulnerability in Pharos Controls Mosaic Show Controller firmware version 2.15.3 could allow an unauthenticated attacker to bypass authentication and execute arbitrary commands with root privileges. View CVE Details Affected Products Pharos Controls Mosaic Show Controller Vendor:Pharos Controls Product Version:Pharos Controls Mosaic Show Controller Firmware: 2.15.3 Product Status:known_affected Remediations MitigationPharos Controls recommends that users upgrade Mosaic Show Controller to version 2.16 or later. Relevant CWE: CWE-306 Missing Authentication for Critical Function Metrics CVSS Version Base Score Base Severity Vector String 3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Acknowledgments James Tully 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. 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. CISA also recommends users take the following measures to protect themselves from social engineering attacks: Do not click web links or open attachments in unsolicited email messages. Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time. Revision History Initial Release Date: 2026-03-24 Date Revision Summary 2026-03-24 1 Initial Publication Legal Notice and Terms of Use This product is provided subject to this Notification and this Privacy & Use policy. Tags Sector: Commercial Facilities Sector Topics: Industrial Control System Vulnerabilities, Industrial Control Systems Please share your thoughts We recently updated our anonymous product survey; we welcome your feedback. Related Advisories Mar 24, 2026 ICS Advisory | ICSA-26-083-02 Schneider Electric EcoStruxure Foxboro DCS Mar 24, 2026 ICS Advisory | ICSA-26-083-03 Schneider Electric Plant iT/Brewmaxx Mar 19, 2026 ICS Advisory | ICSA-26-078-04 Schneider Electric EcoStruxure PME and EPO Mar 19, 2026 ICS Advisory | ICSA-26-078-01 Schneider Electric Modicon M241, M251, and M262

Indicators of Compromise

• cve — CVE-2026-2417
• mitre_attack — CWE-306