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Industrial control advisorySeverity 6.8 medium
Siemens Mendix SAML Module
ICSA-26-302-01 · CISA · October 26, 2026
Summary
Mendix SAML module contains an authentication bypass vulnerability that could allow an unauthenticated remote attacker to gain unauthorized access by replaying a valid SAML assertion in IdP-initiated authentication flows.
Siemens has released new versions for the affected products and recommends to update to the latest versions.
From CISA, quoted as published. Check the source before acting.
What to do
Disable IdP-initiated SSO
Update to V3.6.29 or later version
Update to V4.2.4 or later version
Vendor fix or mitigation, quoted from the advisory.
Each CVE in this advisory
| CVE | Severity | Known exploited | Exploit likelihood |
|---|---|---|---|
| CVE-2026-89209 | 6.8 medium | No | 0.3% |
Severity from the advisory (CVSS), known exploitation from CISA's catalog, exploit likelihood from EPSS (next 30 days).
Affected products
| Vendor | Product |
|---|---|
| Siemens | Mendix SAML (Mendix 10 compatible) |
| Siemens | Mendix SAML (Mendix 11 compatible) |
| Siemens | Mendix SAML (Mendix 9 compatible) |
Why it's on these mode pages
- Maritime: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
- Pipeline: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
- Freight rail: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
- Passenger rail and transit: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
- Highway and motor carrier: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
- Postal and parcel: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
Change history
- October 26, 2026: Publication Date
- October 29, 2026: Initial CISA Republication of Siemens ProductCERT SSA-137528 advisory
- November 9, 2026: First collected by Watch
Securidigm Scout can match advisories like this one to the equipment on your own network, offline. securidigm.com