{
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09"
      },
      "title": "OAuth2: TOCTOU Race Condition in Refresh Token Processing",
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition",
              "lang": "en",
              "cweId": "CWE-367",
              "type": "CWE"
            }
          ]
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "affected": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache CXF",
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "packageName": "org.apache.cxf:cxf-rt-rs-security-oauth2",
          "versions": [
            {
              "status": "affected",
              "version": "4.2.0",
              "lessThan": "4.2.2",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "4.0.0",
              "lessThan": "4.1.7",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "0",
              "lessThan": "3.6.12",
              "versionType": "semver"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ],
      "descriptions": [
        {
          "value": "A race condition in AbstractOAuthDataProvider allows concurrent requests using the same Refresh Token to bypass single-use semantics and generate multiple valid Access Tokens, when 'recycleRefreshTokens' is set to false. A leaked refresh token can be replayed concurrently by multiple attackers or threads.\u00a0Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.",
          "lang": "en",
          "supportingMedia": [
            {
              "type": "text/html",
              "base64": false,
              "value": "A race condition in AbstractOAuthDataProvider allows concurrent requests using the same Refresh Token to bypass single-use semantics and generate multiple valid Access Tokens, when 'recycleRefreshTokens' is set to false. A leaked refresh token can be replayed concurrently by multiple attackers or threads.&nbsp;Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.<br>"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://lists.apache.org/thread/s83t3x4r626o9h8rt0ryr1w7w53l1vv8",
          "tags": [
            "vendor-advisory"
          ]
        }
      ],
      "metrics": [
        {
          "other": {
            "type": "Textual description of severity",
            "content": {
              "text": "low"
            }
          }
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Guanping Zhang reported this vulnerability.",
          "type": "finder"
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "cveId": "CVE-2026-50631",
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "serial": 1,
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}