{"id":"CVE-2026-70478","revision":null,"records":[{"revision":"952b27fa3c9949f0a353430032ecfd85","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-70478","aliases":[],"title":"Flowise: Unauthenticated OAuth2 token refresh endpoint returns access tokens — enables token theft for any connected service","description":"Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the POST /api/v1/oauth2-credential/refresh/:credentialId endpoint is included in WHITELIST_URLS and requires no authentication. The endpoint decrypts the stored credential, sends a refresh request to the configured OAuth provider with the client secret and refresh token, and returns the refreshed access_token in the response body. An attacker with a credential ID can use the token to access the victim's connected service and can also exhaust refresh-token quota. This issue is fixed in 3.1.3.","state":0,"publishedAt":"2026-08-04T19:37:22.02+00:00","modifiedAt":"2026-08-05T19:05:33.447+00:00","affected":[{"ecosystem":"Vendor product","name":"Flowise","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"FlowiseAI\",\n                    \"product\": \"Flowise\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 3.1.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N","score":9.2,"severity":"CRITICAL"}],"references":["https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-qgvm-j2hm-6m38"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-70478","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-70478","identifiers":["CVE-2026-70478"]},"retained":false,"historicalAffected":[]},{"revision":"a0dbbcf3931246cc9259a43a910caddf","observedAt":"2026-11-07T14:22:26.77+00:00","statement":{"source":"euvd","id":"EUVD-2026-52912","aliases":["CVE-2026-70478","GHSA-qgvm-j2hm-6m38"],"title":"Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the POST /api/v1/oauth2-credential/refresh/:credentialId endpoint is included in WHITELIST_URLS and requires no authentication. The end…","description":"Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the POST /api/v1/oauth2-credential/refresh/:credentialId endpoint is included in WHITELIST_URLS and requires no authentication. The endpoint decrypts the stored credential, sends a refresh request to the configured OAuth provider with the client secret and refresh token, and returns the refreshed access_token in the response body. An attacker with a credential ID can use the token to access the victim's connected service and can also exhaust refresh-token quota. This issue is fixed in 3.1.3.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N","score":9.2,"severity":null}],"references":["https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-qgvm-j2hm-6m38"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-52912","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Aug 4, 2026, 7:37:22 PM","dateUpdated":"Aug 5, 2026, 7:05:33 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-52912","identifiers":["EUVD-2026-52912","CVE-2026-70478","GHSA-qgvm-j2hm-6m38"]},"retained":false,"historicalAffected":[]},{"revision":"e64f434806e843539a80caa1538a6f4d","observedAt":"2026-10-25T15:18:57.446+00:00","statement":{"source":"nvd","id":"CVE-2026-70478","aliases":[],"title":"Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the POST /api/v1/oauth2-credential/refresh/:credentialId endpoint is included in WHITELIST_URLS and requires no authentication. The end…","description":"Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the POST /api/v1/oauth2-credential/refresh/:credentialId endpoint is included in WHITELIST_URLS and requires no authentication. The endpoint decrypts the stored credential, sends a refresh request to the configured OAuth provider with the client secret and refresh token, and returns the refreshed access_token in the response body. An attacker with a credential ID can use the token to access the victim's connected service and can also exhaust refresh-token quota. This issue is fixed in 3.1.3.","state":0,"publishedAt":"2026-08-04T20:16:54.61+00:00","modifiedAt":"2026-10-24T15:10:00.19+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/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","score":9.2,"severity":"CRITICAL"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":10,"severity":"CRITICAL"}],"references":["https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-qgvm-j2hm-6m38"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-70478","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-200"],"productCriteria":["cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-08-04T20:16:54.610","lastModified":"2026-10-24T15:10:00.190"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-70478","identifiers":["CVE-2026-70478"]},"retained":false,"historicalAffected":[]},{"revision":"d6c854e50c7b4459af3101f18869d08e","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-qgvm-j2hm-6m38","aliases":["CVE-2026-70478"],"title":"Flowise: Unauthenticated OAuth2 token refresh endpoint returns access tokens — enables token theft for any connected service","description":"### Summary\n\nThe OAuth2 token refresh endpoint (`POST /api/v1/oauth2-credential/refresh/:credentialId`) is in `WHITELIST_URLS`, meaning it requires **no authentication**. It decrypts the stored credential (containing `clientId`, `clientSecret`, `refresh_token`), sends a refresh request to the configured OAuth provider, and returns the new `access_token` directly in the response body.\n\n### Root Cause\n\n```typescript\n// packages/server/src/routes/oauth2/index.ts:393-402\nres.json({\n    success: true,\n    message: 'OAuth2 token refreshed successfully',\n    credentialId: credential.id,\n    tokenInfo: {\n        ...tokenData,  // ← includes access_token!\n        has_new_refresh_token: !!tokenData.refresh_token,\n        expires_at: updatedCredentialData.expires_at\n    }\n})\n```\n\nWhitelist entry at `packages/server/src/utils/constants.ts:40`.\n\n### Attack Chain\n\n1. Attacker obtains a credential ID (via Finding 2 / public chatflow leak, or enumeration)\n2. Attacker calls `POST /api/v1/oauth2-credential/refresh/:credentialId` (no auth required)\n3. Server decrypts credential, sends refresh request to OAuth provider with user's `client_secret`\n4. Server returns the new `access_token` in the response to the attacker\n5. Attacker uses the token to access the victim's connected service (Google, Microsoft, etc.)\n\n### Docker Validation\n\n`POST /api/v1/oauth2-credential/refresh/fake-uuid` returns `{\"message\":\"Credential not found\"}` (not 401 Unauthorized), proving the endpoint processes the request without authentication.\n\n### Impact\n\n- OAuth2 access token theft for any connected service\n- Full access to the victim's third-party accounts (Google, Microsoft, GitHub, etc.)\n- Client secret transmitted to OAuth provider during refresh\n- Can also be used for DoS by exhausting refresh token quota\n\n### Suggested Fix\n\nRemove the refresh endpoint from `WHITELIST_URLS` and require authentication:\n\n```typescript\n// Remove from WHITELIST_URLS in constants.ts\n// Add authentication check in the route handler\n```\n\n---\n\n## Credits\n\n- Shinobi Security - https://github.com/shinobisecurity","state":0,"publishedAt":"2026-08-04T19:37:36+00:00","modifiedAt":"2026-08-04T19:56:08.904264+00:00","affected":[{"ecosystem":"npm","name":"flowise","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"3.1.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"CRITICAL"}],"references":["https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-qgvm-j2hm-6m38","https://github.com/FlowiseAI/Flowise"],"sourceUrl":"https://github.com/advisories/GHSA-qgvm-j2hm-6m38","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-qgvm-j2hm-6m38","identifiers":["GHSA-qgvm-j2hm-6m38","CVE-2026-70478"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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