CVE-2026-21743 (GCVE-0-2026-21743)

Vulnerability from cvelistv5 – Published: 2026-02-10 15:39 – Updated: 2026-02-12 00:27
VLAI
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.
Severity
6.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-10 16:26 UTC
CWE
  • CWE-862 - Improper access control
Assigner
References
Impacted products
Vendor Product Version CPE status
Fortinet FortiAuthenticator Affected: 6.6.0 , ≤ 6.6.6 (semver)
Affected: 6.5.0 , ≤ 6.5.7 (semver)
Affected: 6.4.0 , ≤ 6.4.11 (semver)
Affected: 6.3.0 , ≤ 6.3.5 (semver)
    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:*:*:*:*:*:*:*
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                "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"
                }
              ]
            }
          ],
          "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."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 6.8,
                "baseSeverity": "MEDIUM",
                "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/E:P/RL:U/RC:C",
                "version": "3.1"
              },
              "format": "CVSS"
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-862",
                  "description": "Improper access control",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-02-12T00:27:03.410Z",
            "orgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8",
            "shortName": "fortinet"
          },
          "references": [
            {
              "name": "https://fortiguard.fortinet.com/psirt/FG-IR-25-528",
              "url": "https://fortiguard.fortinet.com/psirt/FG-IR-25-528"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "value": "Upgrade to FortiAuthenticator version 8.0.0 or above\nUpgrade to FortiAuthenticator version 6.6.7 or above"
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8",
        "assignerShortName": "fortinet",
        "cveId": "CVE-2026-21743",
        "datePublished": "2026-02-10T15:39:11.799Z",
        "dateReserved": "2026-01-05T14:17:53.224Z",
        "dateUpdated": "2026-02-12T00:27:03.410Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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

Author Source Type Date Other

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.