FKIE_CVE-2026-59243

Vulnerability from fkie_nvd - Published: 2026-07-29 10:16 - Updated: 2026-10-23 23:10
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
The FAB auth manager's Azure AD OAuth login defaulted `verify_signature=False` when decoding the ID token, so an attacker able to present a forged or unsigned (`alg:none`) ID token to the OAuth callback could bypass authentication and log in as an arbitrary user, including one holding the Admin role (CWE-347). Deployments running the FAB auth manager with the Azure AD OAuth login path under its default configuration are affected; the Authentik path already defaulted to `True`. This issue affects `apache-airflow-providers-fab` before 3.7.3. Users are advised to upgrade to `apache-airflow-providers-fab` 3.7.3, which defaults `verify_signature=True`.
References
security@apache.orghttps://github.com/apache/airflow/pull/69374Patch
security@apache.orghttps://lists.apache.org/thread/x4784l7z00tl3gw4tv2dmvoon77rxgplMailing List, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/07/28/10Mailing List, Third Party Advisory
Impacted products
Vendor Product Version
apache apache-airflow-providers-fab *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://pypi.python.org",
          "defaultStatus": "unaffected",
          "packageName": "apache-airflow-providers-fab",
          "packageURL": "pkg:pypi/apache-airflow-providers-fab",
          "product": "Apache Airflow FAB provider",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThan": "3.7.3",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@apache.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:apache:apache-airflow-providers-fab:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "8594BF55-DBE6-418C-81A1-4B595EEE9DB7",
              "versionEndExcluding": "3.7.3",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The FAB auth manager\u0027s Azure AD OAuth login defaulted `verify_signature=False` when decoding the ID token, so an attacker able to present a forged or unsigned (`alg:none`) ID token to the OAuth callback could bypass authentication and log in as an arbitrary user, including one holding the Admin role (CWE-347). Deployments running the FAB auth manager with the Azure AD OAuth login path under its default configuration are affected; the Authentik path already defaulted to `True`. This issue affects `apache-airflow-providers-fab` before 3.7.3. Users are advised to upgrade to `apache-airflow-providers-fab` 3.7.3, which defaults `verify_signature=True`."
    },
    {
      "lang": "es",
      "value": "El inicio de sesi\u00f3n OAuth de Azure AD del gestor de autenticaci\u00f3n FAB establec\u00eda por defecto \u201cverify_signature=False\u201d al decodificar el token de ID, por lo que un atacante capaz de presentar un token de ID falsificado o sin firmar (\u201calg:none\u201d) a la devoluci\u00f3n de llamada OAuth podr\u00eda omitir la autenticaci\u00f3n e iniciar sesi\u00f3n como un usuario arbitrario, incluyendo uno con el rol de Administrador (CWE-347). Las implementaciones que ejecutan el gestor de autenticaci\u00f3n FAB con la ruta de inicio de sesi\u00f3n OAuth de Azure AD bajo su configuraci\u00f3n predeterminada se ven afectadas; la ruta de Authentik ya establec\u00eda por defecto \u201cTrue\u201d. Este problema afecta a \u201capache-airflow-providers-fab\u201d anterior a 3.7.3. Se aconseja a los usuarios actualizar a \u201capache-airflow-providers-fab\u201d 3.7.3, que establece por defecto \u201cverify_signature=True\u201d."
    }
  ],
  "id": "CVE-2026-59243",
  "lastModified": "2026-10-23T23:10:00.157",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-59243",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-29T15:29:52.670228Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-29T10:16:44.390",
  "references": [
    {
      "source": "security@apache.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/apache/airflow/pull/69374"
    },
    {
      "source": "security@apache.org",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ],
      "url": "https://lists.apache.org/thread/x4784l7z00tl3gw4tv2dmvoon77rxgpl"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/07/28/10"
    }
  ],
  "sourceIdentifier": "security@apache.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "security@apache.org",
      "type": "Secondary"
    }
  ]
}



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