The Siemens 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. The following versions of the Siemens Mendix SAML Module are affected: Mendix SAML (Mendix 10 compatible) vers:intdot/<4.2.4, Mendix SAML (Mendix 11 compatible) vers:intdot/<4.2.4, Mendix SAML (Mendix 9 compatible) vers:intdot/<3.6.29.