Original Article Summary

View CSAF Summary Siemens LOGO! Soft Comfort contains multiple vulnerabilities in its project-file encryption and password handling mechanisms. A local attacker could exploit these vulnerabilities to extract the master key, allowing them to decrypt project data or remove project passwords. The lack of password salting enables offline dictionary or brute-force attacks against the password hashes. Successful exploitation could result in unauthorized access to, or modification of, sensitive project logic and configurations. Siemens has released a new version for LOGO! Soft Comfort and recommends to update to the latest version. The following versions of Siemens LOGO! Soft Comfort are affected: LOGO! Soft Comfort vers:intdot/<9 (CVE-2026-57262, CVE-2026-57263) CVSS Vendor Equipment Vulnerabilities v3 6.8 Siemens Siemens LOGO! Soft Comfort Use of Hard-coded Cryptographic Key, Use of a One-Way Hash without a Salt Background Critical Infrastructure Sectors: Commercial Facilities, Transportation Systems Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany Vulnerabilities Expand All + CVE-2026-57262 Affected products use a static, hardcoded AES master key to encrypt project files. This could allow a local attacker to extract the master key from the application files or memory and use it to decrypt project files or remove project passwords entirely without knowing the actual user-defined password. View CVE Details Affected Products Siemens LOGO! Soft Comfort Vendor: Siemens Product Version: LOGO! Soft Comfort < V9 Product Status: known_affected Remediations Vendor fix Update to V9 or later version Note: A hardware upgrade to LOGO! V9 BM or later is also required to avoid compatibility mode, in which the vulnerabilities addressed by this advisory remain present. Relevant CWE: CWE-321 Use of Hard-coded Cryptographic Key Metrics CVSS Version Base Score Base Severity Vector String 3.1 6.8 MEDIUM CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N CVE-2026-57263 The project password feature in the affected products stores the password as an unsalted SHA-256 hash. This could allow an attacker who has obtained the project file to perform efficient offline dictionary or brute-force attacks against the unsalted hash. View CVE Details Affected Products Siemens LOGO! Soft Comfort Vendor: Siemens Product Version: LOGO! Soft Comfort < V9 Product Status: known_affected Remediations Vendor fix Update to V9 or later version Note: A hardware upgrade to LOGO! V9 BM or later is also required to avoid compatibility mode, in which the vulnerabilities addressed by this advisory remain present. Relevant CWE: CWE-759 Use of a One-Way Hash without a Salt Metrics CVSS Version Base Score Base Severity Vector String 3.1 6.8 MEDIUM CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N Acknowledgments Siemens ProductCERT reported these vulnerabilities to CISA. General Recommendations As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity Additional Resources For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories Terms of Use The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use. 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 exploitation risk of this vulnerability. Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolate 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 recent version available. Also recognize VPN is only as secure as its 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. 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 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. Advisory Conversion Disclaimer This ICSA is a verbatim republication of Siemens ProductCERT SSA-751328 from a direct conversion of the vendor's Common Security Advisory Framework (CSAF) advisory. This is republished to CISA's website as a means of increasing visibility and is provided "as-is" for informational purposes only. CISA is not responsible for the editorial or technical accuracy of republished advisories and provides no warranties of any kind regarding any information contained within this advisory. Further, CISA does not endorse any commercial product or service. Please contact Siemens ProductCERT directly for any questions regarding this advisory. Revision History Initial Release Date: 2026-08-11 Date Revision Summary 2026-08-11 1 Publication Date 2026-08-13 2 Initial CISA Republication of Siemens ProductCERT SSA-751328 advisory Legal Notice and Terms of Use