CVE-2023-29129Network attack vector

Unauthenticated access via insufficient SAML assertion verification

Published Jun 13, 2023 · Updated Jan 3, 2025

Authentication bypass in Siemens Mendix SAML affected branches allows remote attackers to access an application through crafted SAML assertions. The module accepts SAML assertions without sufficient verification when the recommended Use Encryption setting is disabled, leaving the first fix incomplete; Siemens has not disclosed which assertion checks fail. The non-default setting is the reachability gate; successful exploitation grants application access without authentication, with no reported availability impact.

CVSS severity9.1
Critical
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Siemens Mendix SAML affected branches allows remote attackers to access an application through crafted SAML assertions. The module accepts SAML assertions without sufficient verification when the recommended Use Encryption setting is disabled, leaving the first fix incomplete; Siemens has not disclosed which assertion checks fail. The non-default setting is the reachability gate; successful exploitation grants application access without authentication, with no reported availability impact.

The record

CVE
CVE-2023-29129
Published
Jun 13, 2023
Updated
Jan 3, 2025
Vendor
Siemens
Product
Mendix SAML
Classifications
CWE-287, CWE-303, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 3, 2025Record 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 >= V1.16.4 < V1.17.3
  2. Affected versionversion=All versions >= V1.17.3 < V1.18.0
  3. Affected versionversion=All versions >= V2.2.0 < V2.3.0
  4. Affected versionversion=All versions >= V2.3.0 < V2.4.0
  5. Affected versionversion=All versions >= V3.1.8 < V3.2.6
  6. Affected versionversion=All versions >= V3.1.8 < V3.3.0
  7. Affected versionversion=All versions >= V3.1.9 < V3.2.7
  8. Affected versionversion=All versions >= V3.1.9 < V3.3.1
  9. Affected versionversion=All versions >= V3.3.0 < V3.3.14
  10. Affected versionversion=All versions >= V3.3.0 < V3.6.0
  11. Affected versionversion=All versions >= V3.3.1 < V3.3.15
  12. Affected versionversion=All versions >= V3.3.1 < V3.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · Mendix SAMLversion=All versions >= V1.16.4 < V1.17.3; version=All versions >= V1.17.3 < V1.18.0; version=All versions >= V2.2.0 < V2.3.0; version=All versions >= V2.3.0 < V2.4.0; version=All versions >= V3.1.8 < V3.2.6; version=All versions >= V3.1.8 < V3.3.0; version=All versions >= V3.1.9 < V3.2.7; version=All versions >= V3.1.9 < V3.3.1; version=All versions >= V3.3.0 < V3.3.14; version=All versions >= V3.3.0 < V3.6.0; version=All versions >= V3.3.1 < V3.3.15; version=All versions >= V3.3.1 < V3.6.1

Published CVSS scores

9.1Siemens AGCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
CWE-303Incorrect Implementation of Authentication Algorithm
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

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Your stack

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