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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Siemens | Mendix SAML (Mendix 10 compatible) | < V4.2.4 | V4.2.4 |
| Siemens | Mendix SAML (Mendix 11 compatible) | < V4.2.4 | V4.2.4 |
| Siemens | Mendix SAML (Mendix 9 compatible) | < V3.6.29 | V3.6.29 |
Advisories 2
- ICSA-26-302-01 Siemens Mendix SAML Module CISA ICS & IT advisories · Oct 29, 2026
- SSA-137528 SSA-137528: Authentication Bypass Vulnerability in Mendix SAML module Siemens ProductCERT · Oct 26, 2026