What’s Vulnerable › Vulnerabilities

CVE-2026-70636: Flowise 3.1.4 Authentication Bypass via OAuth2 Credential Refresh Endpoint

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-08-06 · updated 2026-10-24
• Weakness: CWE-862

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.

Affected products

• FlowiseAI Flowise: through 3.1.4

References

• https://flowiseai.com/sunset
• https://github.com/Caycon/cve-advisories/blob/main/2026/Flowise/CVE-2026-70636.md
• https://www.vulncheck.com/advisories/flowise-authentication-bypass-via-oauth2-credential-refresh-endpoint

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