FKIE_CVE-2026-21743

Vulnerability from fkie_nvd - Published: 2026-02-10 16:16 - Updated: 2026-06-17 10:18
Severity
7.2 (High) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Summary
A missing authorization vulnerability in Fortinet FortiAuthenticator 6.6.0 through 6.6.6, FortiAuthenticator 6.5 all versions, FortiAuthenticator 6.4 all versions, FortiAuthenticator 6.3 all versions may allow a read-only user to make modification to local users via a file upload to an unprotected endpoint.
References
psirt@fortinet.comhttps://fortiguard.fortinet.com/psirt/FG-IR-25-528Vendor Advisory
Impacted products
Vendor Product Version
fortinet fortiauthenticator *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:fortinet:fortiauthenticator:6.6.6:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.6.5:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.6.4:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.6.3:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.6.2:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.6.1:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.6.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.5.7:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.5.6:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.5.5:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.5.4:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.5.3:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.5.2:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.5.1:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.5.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.4.11:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.4.10:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.4.9:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.4.8:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.4.7:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.4.6:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.4.5:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.4.4:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.4.3:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.4.2:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.4.1:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.4.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.3.5:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.3.4:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.3.3:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.3.2:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.3.1:*:*:*:*:*:*:*",
            "cpe:2.3:a:fortinet:fortiauthenticator:6.3.0:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "product": "FortiAuthenticator",
          "vendor": "Fortinet",
          "versions": [
            {
              "lessThanOrEqual": "6.6.6",
              "status": "affected",
              "version": "6.6.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.5.7",
              "status": "affected",
              "version": "6.5.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.4.11",
              "status": "affected",
              "version": "6.4.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.3.5",
              "status": "affected",
              "version": "6.3.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "psirt@fortinet.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:fortinet:fortiauthenticator:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "C1683FD1-9BDE-4596-9DBC-F146922E022C",
              "versionEndExcluding": "6.6.7",
              "versionStartIncluding": "6.3.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A missing authorization vulnerability in Fortinet FortiAuthenticator 6.6.0 through 6.6.6, FortiAuthenticator 6.5 all versions, FortiAuthenticator 6.4 all versions, FortiAuthenticator 6.3 all versions may allow a read-only user to make modification to local users via a file upload to an unprotected endpoint."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de autorizaci\u00f3n faltante en Fortinet FortiAuthenticator 6.6.0 hasta 6.6.6, FortiAuthenticator 6.5 todas las versiones, FortiAuthenticator 6.4 todas las versiones, FortiAuthenticator 6.3 todas las versiones puede permitir a un usuario de solo lectura realizar modificaciones a usuarios locales a trav\u00e9s de una carga de archivo a un endpoint desprotegido."
    }
  ],
  "id": "CVE-2026-21743",
  "lastModified": "2026-06-17T10:18:59.930",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.2,
        "impactScore": 5.9,
        "source": "psirt@fortinet.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-21743",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-02-10T16:26:05.549911Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-10T16:16:10.903",
  "references": [
    {
      "source": "psirt@fortinet.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://fortiguard.fortinet.com/psirt/FG-IR-25-528"
    }
  ],
  "sourceIdentifier": "psirt@fortinet.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "psirt@fortinet.com",
      "type": "Secondary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.