CVE-2026-63687

{
  "id": "CVE-2026-63687",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-06T12:16:27.843",
  "lastModified": "2026-10-24T16:10:00.153",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Apache CXF's JwtRequestCodeFilter copies all claims from a signed request JWT into the authorization parameter map without excluding security-sensitive parameters. A client that can produce a validly-signed request JWT (e.g., one whose client_secret is known or compromised) can thereby substitute the code_challenge, code_challenge_method, nonce, and state values that were set in the outer HTTP request, undermining PKCE integrity and OpenID Connect replay protection. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue."
    },
    {
      "lang": "es",
      "value": "El JwtRequestCodeFilter de Apache CXF copia todas las ’claims’ de un JWT de solicitud firmado en el mapa de parámetros de autorización sin excluir los parámetros sensibles a la seguridad. Un cliente que puede producir un JWT de solicitud válidamente firmado (por ejemplo, uno cuyo ’client_secret’ es conocido o ha sido comprometido) puede así sustituir los valores de ’code_challenge’, ’code_challenge_method’, ’nonce’ y ’state’ que se establecieron en la solicitud HTTP externa, socavando la integridad de PKCE y la protección contra ataques de repetición de OpenID Connect. Se recomienda a los usuarios actualizar a las versiones 4.2.3 o 4.1.8 o 3.6.12, que corrigen este problema."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache CXF",
          "defaultStatus": "unaffected",
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "packageName": "org.apache.cxf:cxf-rt-rs-security-oauth2",
          "versions": [
            {
              "version": "4.2.0",
              "lessThan": "4.2.3",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "4.0.0",
              "lessThan": "4.1.8",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "3.6.12",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-06T15:18:15.721056Z",
          "id": "CVE-2026-63687",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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  "references": [
    {
      "url": "https://lists.apache.org/thread/drcq4chmt0btx86f17o47j17r378hzpw",
      "source": "[email protected]",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/08/06/22",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ]
}