CVE-2026-89209

{
  "etk_id": "ETK-2026-2643",
  "cve_id": "CVE-2026-89209",
  "display_id": "CVE-2026-89209",
  "ghsa_id": "GHSA-c6gm-hvjc-mr8p",
  "euvd_id": "EUVD-2026-109739",
  "status": "published",
  "anchor_state": "anchored",
  "title": "SAML assertion replay in Mendix SAML",
  "summary": "Mendix SAML modules before the listed fixed releases can accept a previously used SAML assertion during IdP-initiated authentication. An attacker who obtains a valid SAML response may reuse it to access the application without authenticating normally.",
  "mitigation": "Upgrade Mendix SAML for Mendix 10 or 11 to V4.2.4 or later, and Mendix SAML for Mendix 9 to V3.6.29 or later. Restrict exposure of IdP-initiated authentication flows until upgrades are complete.",
  "vendor": "Siemens",
  "product": "Mendix SAML (Mendix 10 compatible)",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < V4.2.4"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "V4.2.4"
      ],
      "package_name": "Mendix SAML (Mendix 10 compatible)",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < V4.2.4"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "V4.2.4"
      ],
      "package_name": "Mendix SAML (Mendix 11 compatible)",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < V3.6.29"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "V3.6.29"
      ],
      "package_name": "Mendix SAML (Mendix 9 compatible)",
      "purl": null
    }
  ],
  "cwes": [
    294
  ],
  "cvss_score": 7.6,
  "cvss_src": "cna_vendor",
  "cvss_vector": "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",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 19.160108683333334,
  "t0_at": "2026-10-26T10:41:01.088000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-26T10:41:01.088000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-26T10:41:01.088000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89209"
    }
  }
}