{"id":"CVE-2026-70478","aliases":["GHSA-qgvm-j2hm-6m38"],"url":"https://o3.security/vulnerability/CVE-2026-70478","summary":"Flowise: Unauthenticated OAuth2 token refresh endpoint returns access tokens — enables token theft for any connected service","details":"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.","published":"2026-08-04T19:37:22.020Z","modified":"2026-09-13T03:46:11.332732418Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"flowise","fixedVersion":"3.1.3"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70478.json"},{"type":"ADVISORY","url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-qgvm-j2hm-6m38"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70478"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-13T03:46:11.332732418Z"}}