{"id":"CVE-2026-70636","title":"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 d…","summary":"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 d…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-862"],"vendor":"flowiseai","product":"flowise","affected":["flowise <= 3.1.4"],"published":"2026-08-06","updated":"2026-09-15","sourceUpdated":"2026-09-15T16:02:22.903","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-70636","references":[{"url":"https://flowiseai.com/sunset","label":"disclosure@vulncheck.com"},{"url":"https://github.com/Caycon/cve-advisories/blob/main/2026/Flowise/CVE-2026-70636.md","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/flowise-authentication-bypass-via-oauth2-credential-refresh-endpoint","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00486,"epssPercentile":0.40995,"ingestedAt":"2026-08-09T01:31:46.669Z","slug":"CVE-2026-70636","body":"## Overview\n\nFlowise 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.\n\n## Affected\n\n- `flowise <= 3.1.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}