What’s Vulnerable › Vulnerabilities

CVE-2026-89209

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-26 · updated 2026-10-31
• Weakness: CWE-294

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.

Affected products

• Siemens Mendix SAML (Mendix 10 compatible): before V4.2.4 — fixed in V4.2.4
• Siemens Mendix SAML (Mendix 11 compatible): before V4.2.4 — fixed in V4.2.4
• Siemens Mendix SAML (Mendix 9 compatible): before V3.6.29 — fixed in V3.6.29

How to fix

Upgrade to a fixed version: Siemens Mendix SAML (Mendix 10 compatible) V4.2.4; Siemens Mendix SAML (Mendix 11 compatible) V4.2.4; Siemens Mendix SAML (Mendix 9 compatible) V3.6.29. Check the vendor advisory for mitigations.

References

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

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