{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2026-24858",
  "revision": 1,
  "title": "Fortinet products — cloud sign-on lets accounts cross devices",
  "summary": "Where cloud single sign-on (SSO) is enabled, an attacker holding their own Fortinet cloud account and one registered device can sign in to devices registered to other accounts — across FortiAnalyzer, FortiManager, FortiOS and FortiProxy.",
  "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": 0.86088,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": false,
    "attack_complexity": "low",
    "kev_added": "2026-01-27",
    "prerequisites": "A Fortinet cloud account with at least one registered device, against targets that have cloud sign-on enabled."
  },
  "remediation": {
    "patch_available": true
  },
  "kill_chain": "initial_access",
  "recommended_action": "Apply the fixes in Fortinet FG-IR-26-060 now; where cloud sign-on is not needed on a device, take it off there and review recent administrative logins.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2026-24858",
      "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-2026-24858",
      "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-2026-24858",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-24858",
      "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-26-060"
    },
    {
      "type": "vendor_advisory",
      "url": "https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios"
    },
    {
      "type": "writeup",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-975644.html"
    }
  ],
  "published_at": "2026-01-27T20:16:24.477Z",
  "issued_at": "2026-09-24T08:51:39.744Z",
  "tags": [
    "fortinet",
    "fortimanager",
    "fortianalyzer",
    "authentication-bypass",
    "kev"
  ]
}