{"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"}}}}