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CVE-2021-23385

Estado: ModificadaMedia (6.1)—

This affects all versions of package Flask-Security. When using the get_post_logout_redirect and get_post_login_redirect functions, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as \\\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using 'autocorrect_location_header=False. **Note:** Flask-Security is not maintained anymore.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Flask-security Project — Flask-security

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-23385",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "report@snyk.io",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.4,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 2.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "report@snyk.io",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "Flask-Security",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2022-08-02T14:15:10.017",
  "references": [
    {
      "url": "https://github.com/mattupstate/flask-security",
      "tags": [
        "Product",
        "Third Party Advisory"
      ],
      "source": "report@snyk.io"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2023/08/msg00034.html",
      "source": "report@snyk.io"
    },
    {
      "url": "https://security.snyk.io/vuln/SNYK-PYTHON-FLASKSECURITY-1293234",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "report@snyk.io"
    },
    {
      "url": "https://snyk.io/blog/url-confusion-vulnerabilities/",
      "tags": [
        "Technical Description",
        "Third Party Advisory"
      ],
      "source": "report@snyk.io"
    },
    {
      "url": "https://github.com/mattupstate/flask-security",
      "tags": [
        "Product",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2023/08/msg00034.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://security.snyk.io/vuln/SNYK-PYTHON-FLASKSECURITY-1293234",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://snyk.io/blog/url-confusion-vulnerabilities/",
      "tags": [
        "Technical Description",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-601"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "This affects all versions of package Flask-Security. When using the get_post_logout_redirect and get_post_login_redirect functions, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as \\\\\\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using 'autocorrect_location_header=False. **Note:** Flask-Security is not maintained anymore."
    },
    {
      "lang": "es",
      "value": "Esto afecta a todas las versiones del paquete Flask-Security. Cuando son usadas las funciones get_post_logout_redirect y get_post_login_redirect, es posible omitirse la comprobación de la URL y redirigir a un usuario a una URL arbitraria proporcionando múltiples barras diagonales traseras como \\\\\\Ndevil.com/path. Esta vulnerabilidad sólo es explotable si es usado un servidor WSGI alternativo que no sea Werkzeug, o es modificado el comportamiento por defecto de Werkzeug usando \"autocorrect_location_header=False. **Nota:** Flask-Security ya no es mantenido"
    }
  ],
  "lastModified": "2026-06-17T03:38:39.950",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:flask-security_project:flask-security:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A64C5EBD-CA0E-4C5C-A6DD-491E03BF261C"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "report@snyk.io"
}