OPCFoundation OPC UA LocalDiscoveryServer (LDS)
CISA warns CVE-2026-77477 (CVSS 4.6) lets local attackers hijack a privileged console during OPC UA LDS installation below version 1.04.420.
CISA published ICSA-26-246-01 for CVE-2026-77477, CWE-250 execution with unnecessary privileges in OPC Foundation UA-LDS-Installers below 1.04.420. An attacker able to launch the installer with elevated privileges and access the keyboard and display can intercept a high-privilege console window during installation and run arbitrary commands. CVSS 3.1 score is 4.6, the issue is not remotely exploitable, and no public exploitation has been reported. Lukas Schumaker of Rockwell Automation reported the flaw to OPC Foundation.
- CVE-2026-77477 is a CWE-250 privilege issue in UA-LDS-Installers below 1.04.420
- Attack requires elevated installer launch plus physical access to keyboard and display
- Not remotely exploitable and no exploitation reported to CISA
- CVSS 3.1 score is 4.6; affects critical infrastructure users of OPC UA LDS
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2026-77477 | NVD description · AI analysis pending | — | — | — | — | — |
Full article438 words · extracted from cisa.gov · click to collapse
Summary
Successful exploitation of this vulnerability could allow an attacker to take control of a high-privilege terminal during installation and run arbitrary commands.
The following versions of OPCFoundation OPC UA LocalDiscoveryServer (LDS) are affected:
- UA-LDS-Installers <1.04.420 (CVE-2026-77477)
| CVSS | Vendor | Equipment | Vulnerabilities |
|---|---|---|---|
| v3 4.6 | OPCFoundation | OPCFoundation OPC UA LocalDiscoveryServer (LDS) | Execution with Unnecessary Privileges |
Background
- Critical Infrastructure Sectors: Chemical, Energy, Food and Agriculture, Water and Wastewater, Critical Manufacturing
- Countries/Areas Deployed: Worldwide
- Company Headquarters Location: United States
Vulnerabilities
CVE-2026-77477
An attacker can intercept a high-privilege console window launched during installation of the LDS. The attacker must be able to launch an installer with elevated privileges and have access to the keyboard and display while the installation is taking place.
Affected Products
OPCFoundation OPC UA LocalDiscoveryServer (LDS)
Vendor:
OPCFoundation
Product Version:
OPCFoundation UA-LDS-Installers: <1.04.420
Product Status:
known_affected
Relevant CWE: CWE-250 Execution with Unnecessary Privileges
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
|---|---|---|---|
| 3.1 | 4.6 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| 4.0 | 2.4 | LOW | CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N |
Acknowledgments
- Lukas Schumaker of Rockwell Automation reported this vulnerability to OPCFoundation.
- OPCFoundation 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. 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. This vulnerability is not exploitable remotely.
Revision History
- Initial Release Date: 2026-09-03
| Date | Revision | Summary |
|---|---|---|
| 2026-09-03 | 1 | Initial Publication |
Legal Notice and Terms of Use
Text extracted automatically; images, tables and formatting may be missing. Original: https://www.cisa.gov/news-events/ics-advisories/icsa-26-246-01