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CVE-2021-32697

Estado: ModificadaMedia (5.3)—

neos/forms is an open source framework to build web forms. By crafting a special `GET` request containing a valid form state, a form can be submitted without invoking any validators. Form state is secured with an HMAC that is still verified. That means that this issue can only be exploited if Form Finishers cause side effects even if no form values have been sent. Form Finishers can be adjusted in a way that they only execute an action if the submitted form contains some expected data. Alternatively a custom Finisher can be added as first finisher. This regression was introduced with https://github.com/neos/form/commit/049d415295be8d4a0478ccba97dba1bb81649567

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)

Neos — Form

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-32697",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "neos",
          "product": "form",
          "versions": [
            {
              "status": "affected",
              "version": ">= 1.2.0, < 4.3.3"
            },
            {
              "status": "affected",
              "version": ">= 5.0.0, < 5.0.9"
            },
            {
              "status": "affected",
              "version": ">= 5.1.0, < 5.1.3"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-06-21T19:15:08.073",
  "references": [
    {
      "url": "https://github.com/neos/form-ghsa-m5vx-8chx-qvmm/pull/1",
      "tags": [
        "Broken Link"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/neos/form/commit/049d415295be8d4a0478ccba97dba1bb81649567",
      "tags": [
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      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/neos/form/releases/tag/5.1.3",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/neos/form/security/advisories/GHSA-m5vx-8chx-qvmm",
      "tags": [
        "Third Party Advisory"
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/neos/form-ghsa-m5vx-8chx-qvmm/pull/1",
      "tags": [
        "Broken Link"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/neos/form/commit/049d415295be8d4a0478ccba97dba1bb81649567",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/neos/form/commit/69de4219b1f58157e2be6b05811463875d75c246",
      "tags": [
        "Patch",
        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
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      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/neos/form/security/advisories/GHSA-m5vx-8chx-qvmm",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "neos/forms is an open source framework to build web forms. By crafting a special `GET` request containing a valid form state, a form can be submitted without invoking any validators. Form state is secured with an HMAC that is still verified. That means that this issue can only be exploited if Form Finishers cause side effects even if no form values have been sent. Form Finishers can be adjusted in a way that they only execute an action if the submitted form contains some expected data. Alternatively a custom Finisher can be added as first finisher. This regression was introduced with https://github.com/neos/form/commit/049d415295be8d4a0478ccba97dba1bb81649567"
    },
    {
      "lang": "es",
      "value": "neos/forms es un framework de código abierto para construir formularios web. Al diseñar una petición especial \"GET\" que contenga un estado de formulario válido, un formulario puede ser enviado sin invocar ningún validador. El estado del formulario está asegurado con un HMAC que sigue siendo comprobado. Esto significa que este problema sólo puede ser explotado si los Form Finishers causan efectos secundarios incluso si no se han enviado valores de formulario. Los finalizadores de formularios pueden ajustarse de manera que sólo ejecuten una acción si el formulario enviado contiene algunos datos esperados. Alternativamente se puede añadir un finalizador personalizado como primer finalizador. Esta regresión se introdujo con https://github.com/neos/form/commit/049d415295be8d4a0478ccba97dba1bb81649567"
    }
  ],
  "lastModified": "2026-06-17T03:53:26.870",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:neos:form:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B2F4EB15-C82B-4C52-89D3-8230FE945E74",
              "versionEndExcluding": "4.3.3",
              "versionStartIncluding": "1.2.0"
            },
            {
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              "versionEndExcluding": "5.1.3",
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          ],
          "operator": "OR"
        }
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  ],
  "sourceIdentifier": "security-advisories@github.com"
}