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CVE-2023-49069 Siemens CVE debrief

CVE-2023-49069 is a medium-severity (CVSS 5.3) authentication vulnerability in Siemens Mendix Runtime affecting versions V8, V9, V10, V10.6, and V10.12. The flaw involves an observable response discrepancy during username validation that allows unauthenticated remote attackers to enumerate valid usernames through differential responses. Published on September 10, 2024, this vulnerability was disclosed through coordinated CISA and Siemens advisories. The vendor has released complete fixes across all affected version lines as of January 2025, with final mitigations for REST/web services and oData APIs added in August 2025. Organizations should prioritize updating to patched versions and migrating away from basic authentication to alternative methods such as OIDC SSO, Mendix SSO, SAML, or custom authentication.

Vendor
Siemens
Product
Mendix Runtime V8
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2024-09-10
Original CVE updated
2025-08-12
Advisory published
2024-09-10
Advisory updated
2025-08-12

Who should care

Organizations operating Siemens Mendix Runtime applications with user authentication, particularly those currently using basic authentication. Security teams responsible for identity and access management in low-code application platforms. OT/ICS security practitioners monitoring CISA advisories for industrial software components.

Technical summary

The vulnerability exists in the authentication mechanism of affected Mendix Runtime applications where username validation produces observable response discrepancies. When an attacker submits authentication requests, differential responses between valid and invalid usernames allow systematic enumeration of user accounts. This information disclosure weakness enables reconnaissance for subsequent targeted attacks. The root cause is improper handling of authentication responses that leak existence information. Complete vendor fixes were released across all affected version lines between November 2024 and January 2025, with additional mitigations for API authentication published August 12, 2025.

Defensive priority

medium

Recommended defensive actions

  • Update Mendix Runtime V8 to version 8.18.33 or later
  • Update Mendix Runtime V9 to version 9.24.31 or later
  • Update Mendix Runtime V10 to version 10.17.0 or later
  • Update Mendix Runtime V10.6 to version 10.6.19 or later
  • Update Mendix Runtime V10.12 to version 10.12.11 or later
  • For app user authentication, replace basic authentication with OIDC SSO, Mendix SSO, SAML version 4.0.0 or higher, or a custom Identity Provider
  • For published REST and web services and oData APIs, replace basic authentication with Custom or Active Session authentication methods
  • Review authentication logs for anomalous username validation patterns that may indicate enumeration attempts

Evidence notes

Vulnerability confirmed through CISA CSAF advisory with Siemens as canonical vendor source. Multiple revision cycles tracked complete fix availability across Mendix Runtime version lines from September 2024 through August 2025.

Sources and references

Verified primary and authoritative sources

  • CVE-2023-49069 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2023-49069

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2023-49069 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2023-49069

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2024/icsa-24-256-05.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-097435.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-097435.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-24-256-05

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    Reference

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.