Siemens Mendix Runtime (Update A)

Siemens Mendix Runtime (Update A) Summary This advisory is revoked. Re-investigation confirmed the reported behavior is expected platform configuration and does not expose the protected attribute. The following versions of Siemens Mendix Runtime are affected: - Siemens Mendix Runtime vers:all/* (CVE-2026-7891) | CVSS | Vendor | Equipment | Vulnerabilities | |---|---|---|---| | v3 9.1 | Siemens | Siemens Mendix Runtime | Insecure Inherited Permissions | Background - Critical Infrastructure Sectors: Critical Manufacturing - Countries/Areas Deployed: Worldwide - Company Headquarters Location: Germany Vulnerabilities CVE-2026-7891 This CVE has been retracted. Re-investigation confirmed the reported behavior is expected platform configuration and does not expose the protected application-specific attribute. Affected Products Siemens Mendix Runtime (Update A) Siemens Siemens Siemens Mendix Runtime: vers:all/* not_affected Remediations Mitigation Vulnerability is rejected as re-investigation confirmed the reported behavior is expected platform configuration and does not expose the protected application-specific attribute (Vulnerable Code Not Present). Mitigation As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for industrial security and following recommendations in the product manuals. https://www.siemens.com/cert/operational-guidelines-industrial-security Mitigation Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage https://www.siemens.com/industrialsecurity Mitigation For more information see the associated Siemens security advisory SSA-814963 in HTML. https://cert-portal.siemens.com/productcert/html/ssa-814963.html Mitigation For more information see the associated Siemens security advisory SSA-814963 in CSAF. https://cert-portal.siemens.com/productcert/csaf/ssa-814963.json Relevant CWE: CWE-277 Insecure Inherited Permissions Metrics | CVSS Version | Base Score | Base Severity | Vector String | |---|---|---|---| | 3.1 | 9.1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | | 4.0 | 9.1 | CRITICAL | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | Acknowledgments - Siemens ProductCERT 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). Recognize VPNs may have vulnerabilities, should be updated to the most recent version available, and are 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. 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. 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: 2026-07-14 | Date | Revision | Summary | |---|---|---| | 2026-07-14 | 1 | Initial Publication | | 2026-07-28 | 2 | Initial Republication of Siemens ProductCERT SSA-814963 | | 2026-09-22 | 3 | Revoked advisory as the CVE is rejected | | 2026-09-24 | 4 | Update A - Revoking advisory after Siemens revoked SSA-814963 and rejecting CVE-2026-7891 | Legal Notice and Terms of Use This product is provided subject to this Notification and this Privacy & Use policy. Vendor - Siemens