CVE-2021-42026Network attack vector

Authenticated metadata disclosure via unchecked client actions

Published Nov 9, 2021 · Updated Aug 4, 2024

Incorrect authorization in Siemens Mendix 8 before 8.18.13 and Mendix 9 before 9.6.2 allows remote authenticated users to read object metadata. Affected client actions return the changedDate attribute without enforcing the object's configured read-access rules. A valid application account and a reachable affected client action are required; exposure is limited to modification-time metadata, not object contents.

CVSS severity4.3
Medium
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Incorrect authorization in Siemens Mendix 8 before 8.18.13 and Mendix 9 before 9.6.2 allows remote authenticated users to read object metadata. Affected client actions return the changedDate attribute without enforcing the object's configured read-access rules. A valid application account and a reachable affected client action are required; exposure is limited to modification-time metadata, not object contents.

The record

CVE
CVE-2021-42026
Published
Nov 9, 2021
Updated
Aug 4, 2024
Vendor
Siemens
Product
Mendix
Classifications
CWE-863, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 9, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions < V8.18.13
  2. Affected versionversion=All versions < V9.6.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · Mendixversion=All versions < V8.18.13; version=All versions < V9.6.2

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo