{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-118669",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-10-28T17:25:37.562Z",
        "datePublished": "2026-10-28T21:09:58.893Z",
        "dateUpdated": "2026-10-28T21:09:58.893Z"
    },
    "containers": {
        "cna": {
            "title": "OAuthLib: Token grants can use attacker-supplied client_id for authorization after authenticating a different client",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-863",
                            "lang": "en",
                            "description": "CWE-863: Incorrect Authorization",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "LOW",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "HIGH",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "HIGH",
                        "subIntegrityImpact": "HIGH",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 8.4,
                        "baseSeverity": "HIGH",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/oauthlib/oauthlib/security/advisories/GHSA-7984-qgvg-3j9c",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/oauthlib/oauthlib/security/advisories/GHSA-7984-qgvg-3j9c"
                },
                {
                    "name": "https://github.com/oauthlib/oauthlib/pull/920",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/oauthlib/oauthlib/pull/920"
                },
                {
                    "name": "https://github.com/oauthlib/oauthlib/commit/c951a1d09f99f14e3240973fa83c4f4287d4753d",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/oauthlib/oauthlib/commit/c951a1d09f99f14e3240973fa83c4f4287d4753d"
                },
                {
                    "name": "https://github.com/oauthlib/oauthlib/releases/tag/v4.0.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/oauthlib/oauthlib/releases/tag/v4.0.0"
                }
            ],
            "affected": [
                {
                    "vendor": "oauthlib",
                    "product": "oauthlib",
                    "versions": [
                        {
                            "version": "< 4.0.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-28T21:09:58.893Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. Prior to 4.0.0, the client_credentials and Resource Owner Password Credentials token grant handlers can authenticate request.client as one confidential client while retaining an attacker-supplied request.client_id for validate_grant_type and validate_scopes. A lower-privilege authenticated client can therefore cause grant and scope authorization to use another client's identity when an application validator relies on the documented client_id argument, potentially issuing tokens with unauthorized grants or scopes. Validators that authorize exclusively from request.client may not be affected. This issue is fixed in version 4.0.0."
                }
            ],
            "source": {
                "advisory": "GHSA-7984-qgvg-3j9c",
                "discovery": "UNKNOWN"
            }
        }
    }
}