{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2025-59718",
  "revision": 1,
  "title": "Fortinet products — forged federated sign-on message accepted",
  "summary": "FortiOS, FortiProxy, FortiSwitchManager and FortiWeb accept a crafted federated sign-on (SAML) message without confirming it was genuinely signed, letting an unauthenticated attacker log in through cloud sign-on.",
  "source_type": "cve",
  "severity": "critical",
  "cvss": {
    "score": 9.8,
    "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "version": "3.1"
  },
  "epss": 0.68293,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": false,
    "attack_complexity": "low",
    "kev_added": "2025-12-16",
    "prerequisites": "Network reach to a device with cloud federated sign-on enabled; no credentials needed."
  },
  "remediation": {
    "patch_available": true
  },
  "kill_chain": "initial_access",
  "recommended_action": "Apply every fix in Fortinet FG-IR-25-647 now — a second CVE covers the same problem; then review cloud sign-on logins across the affected devices.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2025-59718",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "exploitation.known_exploited",
        "exploitation.kev_added"
      ],
      "source": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2025-59718",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "title",
        "summary",
        "severity",
        "remediation",
        "mitre_attack",
        "kill_chain",
        "recommended_action",
        "confidence",
        "tags",
        "exploitation.prerequisites"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2025-59718",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-59718",
      "label": "NVD record"
    },
    {
      "type": "cisa",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "label": "CISA Known Exploited Vulnerabilities catalog"
    },
    {
      "type": "vendor_advisory",
      "url": "https://fortiguard.fortinet.com/psirt/FG-IR-25-647"
    },
    {
      "type": "writeup",
      "url": "https://arcticwolf.com/resources/blog/arctic-wolf-observes-malicious-sso-logins-following-disclosure-cve-2025-59718-cve-2025-59719/"
    },
    {
      "type": "writeup",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-864900.html"
    }
  ],
  "published_at": "2025-12-09T18:15:54.983Z",
  "issued_at": "2026-09-24T08:51:39.744Z",
  "tags": [
    "fortinet",
    "fortios",
    "saml",
    "authentication-bypass",
    "kev"
  ]
}