{
  "document": {
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited. (TLPv2: TLP:CLEAR)",
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "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.\n\nSiemens has released new versions for the affected products and recommends to update to the latest versions.",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens\u0027 operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.\nAdditional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity",
        "title": "General Recommendations"
      },
      {
        "category": "general",
        "text": "For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "productcert@siemens.com",
      "name": "Siemens ProductCERT",
      "namespace": "https://www.siemens.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "SSA-137528: Authentication Bypass Vulnerability in Mendix SAML module - HTML Version",
        "url": "https://cert-portal.siemens.com/productcert/html/ssa-137528.html"
      },
      {
        "category": "self",
        "summary": "SSA-137528: Authentication Bypass Vulnerability in Mendix SAML module - CSAF Version",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-137528.json"
      }
    ],
    "title": "SSA-137528: Authentication Bypass Vulnerability in Mendix SAML module",
    "tracking": {
      "current_release_date": "2026-10-26T00:00:00.000Z",
      "generator": {
        "engine": {
          "name": "Siemens ProductCERT CSAF Generator",
          "version": "1"
        }
      },
      "id": "SSA-137528",
      "initial_release_date": "2026-10-26T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-10-26T00:00:00.000Z",
          "legacy_version": "1.0",
          "number": "1",
          "summary": "Publication Date"
        }
      ],
      "status": "interim",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:intdot/\u003c4.2.4",
                "product": {
                  "name": "Mendix SAML (Mendix 10 compatible) \u003c V4.2.4",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "Mendix SAML (Mendix 10 compatible)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:intdot/\u003c4.2.4",
                "product": {
                  "name": "Mendix SAML (Mendix 11 compatible) \u003c V4.2.4",
                  "product_id": "2"
                }
              }
            ],
            "category": "product_name",
            "name": "Mendix SAML (Mendix 11 compatible)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:intdot/\u003c3.6.29",
                "product": {
                  "name": "Mendix SAML (Mendix 9 compatible) \u003c V3.6.29",
                  "product_id": "3"
                }
              }
            ],
            "category": "product_name",
            "name": "Mendix SAML (Mendix 9 compatible)"
          }
        ],
        "category": "vendor",
        "name": "Siemens"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-89209",
      "cwe": {
        "id": "CWE-294",
        "name": "Authentication Bypass by Capture-replay"
      },
      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "CVE Description"
        }
      ],
      "product_status": {
        "known_affected": [
          "1",
          "2",
          "3"
        ]
      },
      "remediations": [
        {
          "category": "mitigation",
          "details": "Disable IdP-initiated SSO",
          "product_ids": [
            "1",
            "2",
            "3"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update to V3.6.29 or later version",
          "product_ids": [
            "3"
          ],
          "url": "https://marketplace.mendix.com/link/component/1174"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V4.2.4 or later version",
          "product_ids": [
            "1",
            "2"
          ],
          "url": "https://marketplace.mendix.com/link/component/1174"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3"
          ]
        }
      ],
      "title": "CVE-2026-89209"
    }
  ]
}