{"schema":"threatline.record/2","record":{"id":"CVE-2026-118669","aliases":["GHSA-7984-qgvg-3j9c"],"summary":"OAuthLib: Token grants can use attacker-supplied client_id for authorization after authenticating a different client","details":"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.","categories":["Unclassified"],"product":"oauthlib","vendor":"oauthlib","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-118669","source_modified_at":"2026-10-28T21:09:58.893Z","fetched_at":"2026-10-29T00:48:09.584895Z","product":"oauthlib","vendor":"oauthlib","versions":[{"version":"< 4.0.0","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":8.4,"severity":"High","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-28T21:09:58.893Z","modified_at":"2026-10-28T21:09:58.893Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-118669","fetched_at":"2026-10-29T00:48:09.584895Z","source_modified_at":"2026-10-28T21:09:58.893Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://github.com/oauthlib/oauthlib/security/advisories/GHSA-7984-qgvg-3j9c","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/oauthlib/oauthlib/pull/920","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/oauthlib/oauthlib/commit/c951a1d09f99f14e3240973fa83c4f4287d4753d","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/oauthlib/oauthlib/releases/tag/v4.0.0","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-28T21:09:58.893Z","content_hash":"b59cb0ea5d9989fdd2582a743506d84239da8bdb2d06e3d710d66ebc75369e8a"}}