CVE-2026-89209 PUBLISHED

Assigner: siemens
Reserved: 11.09.2026 Published: 26.10.2026 Updated: 26.10.2026

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.

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS Score: 6.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	Required	Availability Impact	None

CVSS 3.1

CVSS 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
CVSS Score: 7.6

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	High	Integrity	High	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	Siemens
Product	Mendix SAML (Mendix 10 compatible)
Versions	Default: unknown affected from 0 to V4.2.4 (excl.)

Vendor	Siemens
Product	Mendix SAML (Mendix 11 compatible)
Versions	Default: unknown affected from 0 to V4.2.4 (excl.)

Vendor	Siemens
Product	Mendix SAML (Mendix 9 compatible)
Versions	Default: unknown affected from 0 to V3.6.29 (excl.)

References

https://cert-portal.siemens.com/productcert/html/ssa-137528.html

Problem Types

CWE-294: Authentication Bypass by Capture-replay CWE