SSA-395458

Siemens Security Advisory by Siemens ProductCERT

SSA-395458: Account Hijacking Vulnerability in Mendix SAML Module

Publication Date:	2025-08-14
Last Update:	2025-08-14
Current Version:	V1.0
CVSS v3.1 Base Score:	8.7

SUMMARY

Mendix SAML module contains a vulnerability that could allow unauthenticated remote attackers to hijack an account in specific SSO configurations.

Mendix has provided fix releases for the Mendix SAML module and recommends to update to the latest version.

KNOWN AFFECTED PRODUCTS

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Affected Product and Versions	Remediation
Mendix SAML (Mendix 9.24 compatible) All versions < V3.6.21 affected by CVE-2025-40758	Update to V3.6.21 or later version https://marketplace.mendix.com/link/component/1174 See further recommendations from section Workarounds and Mitigations
Mendix SAML (Mendix 10.12 compatible) All versions < V4.0.3 affected by CVE-2025-40758	Update to V4.0.3 or later version https://marketplace.mendix.com/link/component/1174 See further recommendations from section Workarounds and Mitigations
Mendix SAML (Mendix 10.21 compatible) All versions < V4.1.2 affected by CVE-2025-40758	Update to V4.1.2 or later version https://marketplace.mendix.com/link/component/1174 See further recommendations from section Workarounds and Mitigations

WORKAROUNDS AND MITIGATIONS

Siemens has identified the following specific workarounds and mitigations that customers can apply to reduce the risk:

CVE-2025-40758: Make sure to use configurations where UseEncryption is enabled

Product-specific remediations or mitigations can be found in the section Known Affected Products.
Please follow the General Security Recommendations.

GENERAL SECURITY RECOMMENDATIONS

As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.

Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity

PRODUCT DESCRIPTION

Mendix SAML module allows you to use SAML to authenticate your users in your cloud application. This module can communicate with any identity provider that supports SAML2.0 or Shibboleth.

VULNERABILITY DESCRIPTION

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This chapter describes all vulnerabilities (CVE-IDs) addressed in this security advisory. Wherever applicable, it also documents the product-specific impact of the individual vulnerabilities.

Vulnerability CVE-2025-40758

Affected versions of the module insufficiently enforce signature validation and binding checks. This could allow unauthenticated remote attackers to hijack an account in specific SSO configurations.

CVSS v3.1 Base Score	8.7
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
CWE	CWE-347: Improper Verification of Cryptographic Signature

ADDITIONAL INFORMATION

For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories

HISTORY DATA

V1.0 (2025-08-14):

Publication Date

The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use.