A vulnerability has been identified in Mendix SAML (Mendix 10 compatible) (All versions < V4.2.4), Mendix SAML (Mendix 11 compatible) (All versions < V4.2.4), Mendix SAML (Mendix 9 compatible) (All versions < V3.6.29). Affected versions of the module do not properly protect against SAML assertion replay in IdP-initiated authentication flows. This could allow unauthenticated remote attackers to gain unauthorized access to the application by replaying a valid SAML response.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Siemens Mendix SAML (Mendix 10 compatible) unknown
Version Status Constraints
0 affected < V4.2.4
Siemens Mendix SAML (Mendix 11 compatible) unknown
Version Status Constraints
0 affected < V4.2.4
Siemens Mendix SAML (Mendix 9 compatible) unknown
Version Status Constraints
0 affected < V3.6.29

No data.

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://cert-portal.siemens.com/productcert/html/ssa-137528.html cve-icon cve-icon
History

Mon, 26 Oct 2026 13:00:00 +0000

Type Values Removed Values Added
Title SAML Assertion Replay Vulnerability in Siemens Mendix SAML Module

Mon, 26 Oct 2026 11:00:00 +0000

Type Values Removed Values Added
Description A vulnerability has been identified in Mendix SAML (Mendix 10 compatible) (All versions < V4.2.4), Mendix SAML (Mendix 11 compatible) (All versions < V4.2.4), Mendix SAML (Mendix 9 compatible) (All versions < V3.6.29). Affected versions of the module do not properly protect against SAML assertion replay in IdP-initiated authentication flows. This could allow unauthenticated remote attackers to gain unauthorized access to the application by replaying a valid SAML response.
Weaknesses CWE-294
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 7.6, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: siemens

Published:

Updated: 2026-10-26T10:41:01.088Z

Reserved: 2026-09-11T07:45:20.919Z

Link: CVE-2026-89209

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-26T11:16:38.583

Modified: 2026-10-26T11:16:38.583

Link: CVE-2026-89209

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-26T12:45:14Z

Weaknesses