CVE-2026-7891
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA documentation gap in Mendix Runtime (all versions) fails to adequately describe special access rule behavior for the System.User entity. This can lead developers to unknowingly configure overly permissive access rules, resulting in sensitive user data exposure or privilege escalation in deployed Mendix applications.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm Mendix application usageIdentify if the environment contains a Mendix application by locating .mpr project files or Mendix deployment artifacts (look for projectroot.mpr, deployment folder structure with Mendix-specific files).Affected if The environment does not contain a Mendix application - this CVE does not apply.
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Locate System.User entity definitionOpen the Mendix Studio Pro or Modeler, navigate to the Domain Model, and locate the System.User entity (typically found in the System module). If working with exported metadata, locate the entity definition for 'System.User' in the model structure.Affected if The System.User entity is not present in the application - this CVE does not apply.
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Inspect access rules for System.User entityIn Mendix Studio Pro, right-click the System.User entity and select 'Access rules', or inspect the exported .mpr XML for <AccessRule> entries targeting the System.User entity. Examine the assigned roles, module roles, and permissions.Affected if No custom access rules are defined for System.User - check default permissions.
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Check for overly permissive read accessReview the access rules to determine if any role grants full Read access to System.User attributes (especially attributes like Password, UserRole, or custom sensitive attributes). Look for rules without XPath constraints that allow broad data access.Affected if Any role has unrestricted Read access to sensitive System.User attributes without XPath constraints.
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Check for overly permissive write accessReview access rules for Write or Create permissions on System.User. Identify if roles can modify user accounts, roles, or permissions beyond what their own privileges should allow.Affected if Any role has Write or Create permissions that allow modifying user accounts or roles they should not manage.
If the Mendix application has System.User entity access rules that grant broad Read or Write permissions without proper XPath constraints or role restrictions, the environment is affected by this CVE.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedReview and remediate access rules on the System.User entity in all deployed Mendix applications to ensure they are not overly permissive, and update internal documentation to reflect secure configuration practices for this entity.
- Review all access rules defined on the System.User entity in your Mendix application model
- Ensure that access rules for System.User do not grant overly permissive access to sensitive attributes such as password hashes, roles, or personal identification data
- Apply the principle of least privilege - only grant the minimum access necessary for each user role
- Consult Mendix security documentation and consider reaching out to Mendix support for clarification on System.User entity access rules
- Verify that no unauthenticated or anonymous users can access privileged user information through the System.User entity
- Test access controls in a non-production environment to confirm proper restriction of user data
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation8.0 h
- Implementation16.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $10,240.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-7891 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-7891 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data