{"id":"CVE-2026-70636","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-70636","summary":"Flowise 3.1.4 Authentication Bypass via OAuth2 Credential Refresh Endpoint","details":"Flowise through 3.1.4 contains an authentication bypass vulnerability that allows unauthenticated attackers to access the OAuth2 credential refresh endpoint by exploiting prefix-based whitelist matching in the authentication middleware defined in packages/server/src/utils/constants.ts. Attackers can send a POST request to the oauth2-credential refresh route with a trailing credential identifier to bypass all authentication and authorization checks, triggering unauthorized OAuth token rotation against credentials belonging to any workspace and potentially disrupting dependent OAuth integrations. This is a bypass of CVE-2026-41273.","published":"2026-08-06T21:31:55.768Z","modified":"2026-08-15T04:07:00.254586142Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"https://flowiseai.com/sunset"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70636.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70636"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/flowise-authentication-bypass-via-oauth2-credential-refresh-endpoint"},{"type":"PACKAGE","url":"https://github.com/FlowiseAI/Flowise"},{"type":"EVIDENCE","url":"https://github.com/Caycon/cve-advisories/blob/main/2026/Flowise/CVE-2026-70636.md"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-15T04:07:00.254586142Z"}}