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CVE-2017-18924

Status: ModifiedHigh (7.5)—

oauth2-server (aka node-oauth2-server) through 3.1.1 implements OAuth 2.0 without PKCE. It does not prevent authorization code injection. This is similar to CVE-2020-7692. NOTE: the vendor states 'As RFC7636 is an extension, I think the claim in the Readme of "RFC 6749 compliant" is valid and not misleading and I also therefore wouldn't describe this as a "vulnerability" with the library per se.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Oauth2-server Project — Oauth2-server

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2017-18924",
  "cveTags": [
    {
      "tags": [
        "disputed"
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      "sourceIdentifier": "cve@mitre.org"
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  "metrics": {
    "cvssMetricV2": [
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        "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
      }
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    "cvssMetricV31": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
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  "affected": [
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      "source": "cve@mitre.org",
      "affectedData": [
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  "published": "2020-10-04T05:15:12.140",
  "references": [
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      "tags": [
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      "source": "cve@mitre.org"
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      "source": "cve@mitre.org"
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    {
      "url": "https://tools.ietf.org/html/rfc7636",
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      "tags": [
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      "url": "https://tools.ietf.org/html/draft-ietf-oauth-security-topics-15",
      "tags": [
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    {
      "url": "https://tools.ietf.org/html/rfc7636",
      "tags": [
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      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "oauth2-server (aka node-oauth2-server) through 3.1.1 implements OAuth 2.0 without PKCE. It does not prevent authorization code injection. This is similar to CVE-2020-7692. NOTE: the vendor states 'As RFC7636 is an extension, I think the claim in the Readme of \"RFC 6749 compliant\" is valid and not misleading and I also therefore wouldn't describe this as a \"vulnerability\" with the library per se."
    },
    {
      "lang": "es",
      "value": "** EN DISPUTA ** oauth2-server (también se conoce como node-oauth2-server) versiones hasta 3.1.1, implementa OAuth versión 2.0 sin PKCE. No impide la inyección de código de autorización. Esto es similar a CVE-2020-7692. NOTA: el proveedor declara \"Como RFC7636 es una extensión, considero que la afirmación en el archivo Léame de \"compatible con RFC 6749\" es válida y no engañosa y, por lo tanto, tampoco describiría esto como una \"vulnerabilidad\" con la biblioteca en sí"
    }
  ],
  "lastModified": "2026-06-17T01:13:50.523",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "versionEndIncluding": "3.1.1"
            }
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          "operator": "OR"
        }
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  ],
  "sourceIdentifier": "cve@mitre.org"
}