{"id":"CVE-2026-59358","revision":"7d0f8d84821e41cab95d80131be8b19c","records":[{"revision":"7d0f8d84821e41cab95d80131be8b19c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-59358","aliases":[],"title":"UAA OAuth Token Endpoint Vulnerability allows user access token reuse for client_credentials grant type","description":"Improper authentication (CWE-287) in the OAuth token endpoint in Cloud Foundry UAA allows a remote, authenticated attacker holding a valid user access token to obtain a fully-privileged client_credentials token for the OAuth client that issued it, by presenting the user token as an OAuth 2.0 Bearer credential on a client_credentials grant request in place of the client’s configured secret.\n\n\n\nUAA’s client_credentials handling does not verify that the Bearer credential supplied for client authentication is actually a client credential (a client secret or a valid configured client authentication method); it accepts any valid access token whose client_id matches the request. A token obtained by a normal end user through a public authorization_code + PKCE flow — scoped only to uaa.user, carrying a user_id, and recording client_auth_method=none — satisfies this check. That user token cannot itself administer OAuth clients (POST /oauth/clients correctly returns 403), but when replayed as Bearer authentication on a client_credentials request for the same client, UAA issues a new client-only token carrying the client’s full authorities, such as clients.write. An attacker can use that token to create arbitrary new OAuth clients, including clients with attacker-chosen authorities, without ever possessing the client’s actual secret.\n\n\n\nExploitation requires a valid user access token (the attacker’s own) for a client that is configured to support both a public, user-facing authorization flow and the client_credentials grant type on the same client_id — a non-default combination. Practical impact scales with the authorities assigned to that client.","state":0,"publishedAt":"2026-10-06T06:54:10.861+00:00","modifiedAt":"2026-10-06T14:34:25.951+00:00","affected":[{"ecosystem":"Vendor product","name":"UAA","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Cloud Foundry\",\n                    \"product\": \"UAA\",\n                    \"repo\": \"https://github.com/cloudfoundry/uaa\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"3.7.0\",\n                            \"lessThanOrEqual\": \"79.6.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"unaffected\",\n                            \"version\": \"79.7.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"cf-deployment","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Cloud Foundry\",\n                    \"product\": \"cf-deployment\",\n                    \"repo\": \"https://github.com/cloudfoundry/cf-deployment\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThanOrEqual\": \"60.4.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"unaffected\",\n                            \"version\": \"60.5.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":7.6,"severity":"HIGH"}],"references":["https://www.cloudfoundry.org/blog/cve-2026-59358-uaa-oauth-token-endpoint-vulnerability-allows-user-access-token-reuse-for-client_credentials-grant-type/"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-59358","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-59358","identifiers":["CVE-2026-59358"]},"retained":false,"historicalAffected":[]}],"coverage":[]}