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CVE-2019-18886

Estado: ModificadaMedia (5.3)—

An issue was discovered in Symfony 4.2.0 to 4.2.11 and 4.3.0 to 4.3.7. The ability to enumerate users was possible due to different handling depending on whether the user existed when making unauthorized attempts to use the switch users functionality. This is related to symfony/security.

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)

Sensiolabs — Symfony

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2019-18886",
  "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:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "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:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
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              "status": "affected",
              "version": "n/a"
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  ],
  "published": "2019-11-21T18:15:11.820",
  "references": [
    {
      "url": "https://github.com/symfony/symfony/releases/tag/v4.3.8",
      "tags": [
        "Release Notes"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://symfony.com/blog/cve-2019-18886-prevent-user-enumeration-using-switch-user-functionality",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
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      "tags": [
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    },
    {
      "url": "https://github.com/symfony/symfony/releases/tag/v4.3.8",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://symfony.com/blog/cve-2019-18886-prevent-user-enumeration-using-switch-user-functionality",
      "tags": [
        "Vendor Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "tags": [
        "Release Notes"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-203"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Symfony 4.2.0 to 4.2.11 and 4.3.0 to 4.3.7. The ability to enumerate users was possible due to different handling depending on whether the user existed when making unauthorized attempts to use the switch users functionality. This is related to symfony/security."
    },
    {
      "lang": "es",
      "value": "Se detectó un problema en Symfony versiones 4.2.0 hasta 4.2.11 y 4.3.0 hasta 4.3.7. La capacidad para enumerar usuarios fue posible debido a un manejo diferente dependiendo de si el usuario existía cuando se realizaron intentos no autorizados de utilizar la funcionalidad switch users. Esto está relacionado con Symfony/Security."
    }
  ],
  "lastModified": "2026-06-17T02:25:31.690",
  "configurations": [
    {
      "nodes": [
        {
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          "cpeMatch": [
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              "vulnerable": true,
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              "versionEndIncluding": "4.2.11",
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          ],
          "operator": "OR"
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  "sourceIdentifier": "cve@mitre.org"
}