CVE-2026-70636 Details
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.
An authentication bypass vulnerability has been identified in Flowise versions through 3.1.4, allowing unauthenticated attackers to access the OAuth2 credential refresh endpoint. This vulnerability arises from prefix-based whitelist matching in the authentication middleware, which enables attackers to send POST requests to the refresh route with a credential identifier, bypassing all authentication and authorization checks. As a result, unauthorized OAuth token rotation can be triggered for credentials belonging to any workspace, potentially disrupting related OAuth integrations.
To address this vulnerability, remove the OAuth refresh endpoint from the whitelist and require authentication and workspace ownership verification before allowing credential refresh operations.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Aug 8, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://flowiseai.com/sunset | [email protected] | Not Applicable |
| https://github.com/Caycon/cve-advisories/blob/main/2026/Flowise/CVE-2026-70636.md | [email protected] | ExploitThird Party Advisory |
| https://www.vulncheck.com/advisories/flowise-authentication-bypass-via-oauth2-credential-refresh-endpoint | [email protected] | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-862 | Missing Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| flowiseai flowise | <= 3.1.4 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 15, 2026 | Initial Analysis | [email protected] |
| Aug 8, 2026 | CVE Modified | CISA-ADP |
| Aug 7, 2026 | CVE Modified | [email protected] |
| Aug 6, 2026 | New CVE Received | [email protected] |