[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f2ls0kAMi9RYcyODKpN68MplCyoIrtuI3QI3dhII12bM":3},{"lesson":4},{"id":5,"slug":6,"article_id":7,"title":8,"body":9,"prevention":10,"framework_refs":11,"status":23,"created_at":24,"published_at":25,"article":26,"tags":30,"podcasts":49},"3fc27551-6e03-466b-ae5d-c6222dd3d125","siemens-mendix-runtime-documentation-gap-enables-privilege-escalation-via-overly-permissive-access-r","f19bd142-3e3d-4f21-b0c4-0fdb25dec1c3","Siemens Mendix Runtime: Documentation Gap Enables Privilege Escalation via Overly Permissive Access Rules","The root cause of CVE-2026-7891 is a critical documentation failure in Siemens Mendix Runtime that leaves developers without clear, actionable guidance on how to securely configure access rules for the System.User entity. Without this guidance, developers inadvertently apply overly permissive rules that grant anonymous user roles unintended access to all stored records, potentially exposing sensitive user data and enabling privilege escalation. This matters because misconfigured access controls in low-code\u002Fno-code platforms are particularly dangerous — developers may not have deep security expertise and rely heavily on vendor documentation to implement safe defaults. The high CVSS score of 9.1 reflects the real-world blast radius: any deployed Mendix application could be silently misconfigured at scale across an organization's entire application portfolio.","**Immediate actions:**\n- Audit all deployed Mendix applications to review and restrict access rules applied to the System.User entity, removing any permissions granted to anonymous roles.\n- Apply the principle of least privilege to all entity-level access rules and validate configurations against Siemens' latest security advisories.\n\n**Long-term improvements:**\n- Integrate automated static analysis and security linting tools into CI\u002FCD pipelines to flag overly permissive access rule configurations before deployment.\n- Establish a mandatory secure-by-default configuration baseline for all low-code platform projects, reviewed and approved by a security architect prior to go-live.\n- Require vendor security documentation reviews as part of onboarding any new low-code or rapid application development platform.\n\n**Detection measures:**\n- Enable runtime access logging for the System.User entity to detect anomalous or unauthorized data retrieval attempts by anonymous or low-privilege roles.\n- Schedule periodic penetration tests and configuration reviews specifically targeting access control rules in all production Mendix applications.",[12,13,14,15,16,17,18,19,20,21,22],"CIS Control 4: Secure Configuration of Enterprise Assets and Software","CIS Control 6: Access Control Management","NIST SP 800-53 AC-2: Account Management","NIST SP 800-53 AC-3: Access Enforcement","NIST SP 800-53 AC-6: Least Privilege","NIST SP 800-53 CM-6: Configuration Settings","NIST SP 800-53 CM-7: Least Functionality","GDPR Article 25: Data Protection by Design and by Default","GDPR Article 32: Security of Processing","OWASP Top 10 A01:2021 – Broken Access Control","IEC 62443-3-3 SR 2.1: Authorization Enforcement","published","2026-07-28T16:22:36.119066+00:00","2026-07-28T16:22:35.825+00:00",{"id":7,"url":27,"slug":28,"title":29},"https:\u002F\u002Fwww.cisa.gov\u002Fnews-events\u002Fics-advisories\u002Ficsa-26-209-02","siemens-mendix-runtime-d37255","Siemens Mendix Runtime",[31,37,43],{"id":32,"name":33,"slug":34,"description":35,"color":36},"1ec88fde-2d0f-4ed8-932a-33f5ccc0fdc7","Access Control","access-control","Excessive privileges, missing MFA, weak auth","#f97316",{"id":38,"name":39,"slug":40,"description":41,"color":42},"7261eb8f-acd4-4d93-a489-7fdd652ec0ea","Security Awareness","security-awareness","Phishing, social engineering, human error","#22c55e",{"id":44,"name":45,"slug":46,"description":47,"color":48},"859cf0ad-a7e9-42bb-a75d-bac6511fa5d5","Configuration Management","configuration-management","Misconfigs, default credentials, exposed services","#eab308",[]]