CVE-2026-59358

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-59358", "assignerOrgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d", "state": "PUBLISHED", "assignerShortName": "vmware", "dateReserved": "2026-07-04T18:14:46.172Z", "datePublished": "2026-10-06T06:54:10.861Z", "dateUpdated": "2026-10-06T14:34:25.951Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d", "shortName": "vmware", "dateUpdated": "2026-10-06T06:54:10.861Z"}, "title": "UAA OAuth Token Endpoint Vulnerability allows user access token reuse for client_credentials grant type", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-287", "description": "CWE-287: Improper Authentication", "type": "CWE"}]}], "affected": [{"vendor": "Cloud Foundry", "product": "UAA", "repo": "https://github.com/cloudfoundry/uaa", "versions": [{"status": "affected", "version": "3.7.0", "lessThanOrEqual": "79.6.0", "versionType": "semver"}, {"status": "unaffected", "version": "79.7.0", "versionType": "semver"}]}, {"vendor": "Cloud Foundry", "product": "cf-deployment", "repo": "https://github.com/cloudfoundry/cf-deployment", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "60.4.0", "versionType": "semver"}, {"status": "unaffected", "version": "60.5.0", "versionType": "semver"}]}], "descriptions": [{"lang": "en", "value": "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\u2019s configured secret.\n\n\n\nUAA\u2019s 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 \u2014 scoped only to uaa.user, carrying a user_id, and recording client_auth_method=none \u2014 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\u2019s 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\u2019s actual secret.\n\n\n\nExploitation requires a valid user access token (the attacker\u2019s 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 \u2014 a non-default combination. Practical impact scales with the authorities assigned to that client.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>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\u2019s configured secret.</p><p>UAA\u2019s 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 \u2014 scoped only to uaa.user, carrying a user_id, and recording client_auth_method=none \u2014 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\u2019s 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\u2019s actual secret.</p><p>Exploitation requires a valid user access token (the attacker\u2019s 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 \u2014 a non-default combination. Practical impact scales with the authorities assigned to that client.</p>"}]}], "references": [{"url": "https://www.cloudfoundry.org/blog/cve-2026-59358-uaa-oauth-token-endpoint-vulnerability-allows-user-access-token-reuse-for-client_credentials-grant-type/"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 7.6, "vectorString": "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"}}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-06T14:32:48.583303Z", "id": "CVE-2026-59358", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-06T14:34:25.951Z"}}]}}

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A token obtained by a normal end user through a public authorization_code + PKCE flow \u2014 scoped only to uaa.user, carrying a user_id, and recording client_auth_method=none \u2014 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\u2019s 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\u2019s actual secret.\n\n\n\nExploitation requires a valid user access token (the attacker\u2019s 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 \u2014 a non-default combination. Practical impact scales with the authorities assigned to that client.", "supportingMedia": [{"type": "text/html", "value": "<p>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\u2019s configured secret.</p><p>UAA\u2019s 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 \u2014 scoped only to uaa.user, carrying a user_id, and recording client_auth_method=none \u2014 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\u2019s 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\u2019s actual secret.</p><p>Exploitation requires a valid user access token (the attacker\u2019s 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 \u2014 a non-default combination. 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{"affected": [{"affectedData": [{"product": "UAA", "repo": "https://github.com/cloudfoundry/uaa", "vendor": "Cloud Foundry", "versions": [{"lessThanOrEqual": "79.6.0", "status": "affected", "version": "3.7.0", "versionType": "semver"}, {"status": "unaffected", "version": "79.7.0", "versionType": "semver"}]}, {"product": "cf-deployment", "repo": "https://github.com/cloudfoundry/cf-deployment", "vendor": "Cloud Foundry", "versions": [{"lessThanOrEqual": "60.4.0", "status": "affected", "version": "0", "versionType": "semver"}, {"status": "unaffected", "version": "60.5.0", "versionType": "semver"}]}], "source": "security@vmware.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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\u2019s configured secret.\n\n\n\nUAA\u2019s 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 \u2014 scoped only to uaa.user, carrying a user_id, and recording client_auth_method=none \u2014 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\u2019s 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\u2019s actual secret.\n\n\n\nExploitation requires a valid user access token (the attacker\u2019s 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 \u2014 a non-default combination. Practical impact scales with the authorities assigned to that client."}], "id": "CVE-2026-59358", "lastModified": "2026-10-06T16:00:36.547", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.6, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security@vmware.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-59358", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-06T14:32:48.583303Z", "version": "2.0.3"}}]}, "published": "2026-10-06T07:16:59.460", "references": [{"source": "security@vmware.com", "url": "https://www.cloudfoundry.org/blog/cve-2026-59358-uaa-oauth-token-endpoint-vulnerability-allows-user-access-token-reuse-for-client_credentials-grant-type/"}], "sourceIdentifier": "security@vmware.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}], "source": "security@vmware.com", "type": "Secondary"}]}

{}

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