CVE-2026-7891: CWE-277: Insecure Inherited Permissions in Siemens Mendix Runtime
A vulnerability has been identified in Mendix Runtime (All versions). Mendix documentation for access rules does not adequately describe the special behavior of the System.User entity, leaving developers without sufficient guidance to configure access rules securely. This documentation gap may lead application developers to unknowingly apply overly permissive access rules to System.User, resulting in unintended exposure of sensitive user data or privilege escalation within deployed Mendix applications.
AI Analysis
Technical Summary
This vulnerability concerns Mendix Runtime's access control mechanism, specifically the System.User entity. The Mendix documentation does not adequately explain the unique behavior of this entity, leading to potential misconfiguration of access rules by application developers. As a result, applications may inadvertently grant excessive permissions, exposing sensitive user information or allowing privilege escalation. The vulnerability affects all versions of Mendix Runtime, and no official remediation or patch is currently documented.
Potential Impact
If exploited, this vulnerability could allow unauthorized users to access sensitive user data or escalate their privileges within Mendix applications. This compromises confidentiality and integrity but does not affect availability. The CVSS score of 9.1 reflects a critical severity with network attack vector, low attack complexity, no privileges required, no user interaction, and high impact on confidentiality and integrity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix or guidance is provided by Siemens, application developers should carefully review and test access rules related to the System.User entity to avoid overly permissive configurations. Monitoring vendor communications for updates is recommended.
CVE-2026-7891: CWE-277: Insecure Inherited Permissions in Siemens Mendix Runtime
Description
A vulnerability has been identified in Mendix Runtime (All versions). Mendix documentation for access rules does not adequately describe the special behavior of the System.User entity, leaving developers without sufficient guidance to configure access rules securely. This documentation gap may lead application developers to unknowingly apply overly permissive access rules to System.User, resulting in unintended exposure of sensitive user data or privilege escalation within deployed Mendix applications.
CVSS v3.1
Score 9.1critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability concerns Mendix Runtime's access control mechanism, specifically the System.User entity. The Mendix documentation does not adequately explain the unique behavior of this entity, leading to potential misconfiguration of access rules by application developers. As a result, applications may inadvertently grant excessive permissions, exposing sensitive user information or allowing privilege escalation. The vulnerability affects all versions of Mendix Runtime, and no official remediation or patch is currently documented.
Potential Impact
If exploited, this vulnerability could allow unauthorized users to access sensitive user data or escalate their privileges within Mendix applications. This compromises confidentiality and integrity but does not affect availability. The CVSS score of 9.1 reflects a critical severity with network attack vector, low attack complexity, no privileges required, no user interaction, and high impact on confidentiality and integrity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix or guidance is provided by Siemens, application developers should carefully review and test access rules related to the System.User entity to avoid overly permissive configurations. Monitoring vendor communications for updates is recommended.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- DIVD
- Date Reserved
- 2026-05-05T21:09:08.070Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fd029ecbff5d861038a13d
Added to database: 05/07/2026, 21:22:38 UTC
Last enriched: 07/15/2026, 11:31:23 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 136
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