CVE-2026-49272

{
  "id": "CVE-2026-49272",
  "sourceIdentifier": "[email protected]",
  "published": "2026-11-05T21:18:50.447",
  "lastModified": "2026-11-05T22:18:44.593",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. From 3.3.0 until 4.0.1, OAuthLib's RFC 8628 device workflow does not require DeviceCodeGrant.validate_token_request to check that the device_code parameter is present and valid. A caller whose client request is accepted by the configured validator and who knows a valid client ID enabled for the device workflow can submit a missing or bogus device code to the token endpoint and obtain a bearer token without completing device authorization. This issue is fixed in version 4.0.1."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "oauthlib",
          "product": "oauthlib",
          "versions": [
            {
              "version": ">= 3.3.0, < 4.0.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N",
          "baseScore": 8.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 4.7
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-11-05T21:14:28.774870Z",
          "id": "CVE-2026-49272",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/oauthlib/oauthlib/commit/77a5f1c8ce00da2b0b8c5f6e9cc129920085f114",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/oauthlib/oauthlib/pull/954",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/oauthlib/oauthlib/releases/tag/v4.0.1",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/oauthlib/oauthlib/security/advisories/GHSA-3jp2-3mrg-2vxc",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/oauthlib/oauthlib/security/advisories/GHSA-3jp2-3mrg-2vxc",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}