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Siemens License Server (SLS)

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CVEVulnerabilityUpdatePrivilege EscalationCritical

Overview

Siemens License Server (SLS) has been found to contain multiple vulnerabilities that could allow attackers to gain elevated privileges and access arbitrary files on affected systems. Specifically, versions prior to 5.1 and 5.3 are vulnerable to local privilege escalation and path traversal, respectively. The first vulnerability, CVE-2026-69108, stems from an insecure sudoers policy, while CVE-2026-69109 results from inadequate input sanitization. Siemens recommends that users update to version 5.1 or later for the privilege escalation issue and to version 5.3 or later for the path traversal vulnerability. This is crucial as the vulnerabilities could lead to significant security breaches, including complete system compromise.

Key Takeaways

  • Affected Systems: Siemens License Server (SLS) versions < 5.1 and < 5.3; Siemens
  • Action Required: Update to Siemens License Server (SLS) version 5.
  • Timeline: Disclosed on August 11, 2026

Original Article Summary

View CSAF Summary Siemens License Server is affected by multiple vulnerabilities which could allow an attacker to elevate its privileges and read arbitrary files on the system. Siemens has released a new version for Siemens License Server (SLS) and recommends to update to the latest version. The following versions of Siemens License Server (SLS) are affected: Siemens License Server (SLS) vers:intdot/<5.1, vers:intdot/<5.3 (CVE-2026-69108, CVE-2026-69109) CVSS Vendor Equipment Vulnerabilities v3 7.5 Siemens Siemens License Server (SLS) Incorrect Permission Assignment for Critical Resource, Path Traversal: '.../...//' Background Critical Infrastructure Sectors: Information Technology Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany Vulnerabilities Expand All + CVE-2026-69108 The affected application is vulnerable to a local privilege escalation due to an insecure sudoers policy. This could allow an attacker to execute arbitrary commands and plant malicious files as root, leading to full system compromise. View CVE Details Affected Products Siemens License Server (SLS) Vendor: Siemens Product Version: Siemens License Server (SLS) < V5.1 Product Status: known_affected Remediations Vendor fix Update to V5.1 or later version https://support.sw.siemens.com/product/1586485382/ Relevant CWE: CWE-732 Incorrect Permission Assignment for Critical Resource Metrics CVSS Version Base Score Base Severity Vector String 3.1 6 MEDIUM CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N CVE-2026-69109 The affected application is vulnerable to a path traversal vulnerability due to lack of sanitization of user input. This could allow a remote attacker to access arbitrary files on the application. View CVE Details Affected Products Siemens License Server (SLS) Vendor: Siemens Product Version: Siemens License Server (SLS) < V5.3 Product Status: known_affected Remediations Vendor fix Update to V5.3 or later version https://support.sw.siemens.com/product/1586485382/ Relevant CWE: CWE-35 Path Traversal: '.../...//' Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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-077553 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-077553 advisory Legal Notice and Terms of Use

Impact

Siemens License Server (SLS) versions < 5.1 and < 5.3; Siemens

Exploitation Status

The exploitation status is currently unknown. Monitor vendor advisories and security bulletins for updates.

Timeline

Disclosed on August 11, 2026

Remediation

Update to Siemens License Server (SLS) version 5.1 or later for CVE-2026-69108 and version 5.3 or later for CVE-2026-69109. Additionally, protect network access to devices and configure the environment according to Siemens' operational guidelines for Industrial Security.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Vulnerability, Update, and 2 more.

Read Original Article

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