CVE-2026-70636
Flowise 3.1.4 Authentication Bypass via OAuth2 Credential Refresh Endpoint
- State
- Published
- Severity
- 8.7 High
- Published
- Aug 6, 2026
- Updated
- Aug 14, 2026
- Reserved
- Aug 4, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N | VulnCheck |
Weaknesses
- CWE-862 Missing Authorization
Affected Products
| Product | Versions |
|---|---|
FlowiseFlowiseAI |
|
References
- Researcher Disclosuretechnical-descriptionexploit
- Sunset Announcementvendor-advisory
- https://www.vulncheck.com/advisories/flowise-authentication-bypass-via-oauth2-credential-refresh-endpointthird-party-advisory
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