Mendix SAML (Mendix 10 compatible), Mendix SAML (Mendix 11 compatible) and 1 more products — security advisory

{
  "id": "66fa0d8e3a582ac8ddd2593244dd1d051a05e58202c6ff1c1dacf55fa0c6fb07",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-89209",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-89209",
    "summary": "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.",
    "evidence": "cve:CVE-2026-89209",
    "products": [
      {
        "name": {
          "value": "Mendix SAML (Mendix 10 compatible)",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Mendix SAML (Mendix 11 compatible)",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Mendix SAML (Mendix 9 compatible)",
          "evidence": "/containers/cna/affected/2/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-89209",
      "aliases": [
        "CVE-2026-89209"
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "version": "3.1",
            "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"
          }
        },
        {
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 7.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
          }
        }
      ],
      "affected": [
        {
          "vendor": "Siemens",
          "product": "Mendix SAML (Mendix 10 compatible)",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "V4.2.4",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "Mendix SAML (Mendix 11 compatible)",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "V4.2.4",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "Mendix SAML (Mendix 9 compatible)",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "V3.6.29",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        }
      ],
      "modified": "2026-10-26T10:41:01.088Z",
      "provider": "cve",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-137528.html"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "cec7a2ec-15b4-4faf-bd53-b40f371f3a77",
          "shortName": "siemens",
          "dateUpdated": "2026-10-26T10:41:01.088Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89209",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 285280,
  "published_at": "2026-10-26T10:41:01.088+00:00"
}