github.com
https://github.com/FlowiseAI/Flowise CVE-2026-70478
CRITICAL
Flowise: Unauthenticated OAuth2 token refresh endpoint returns access tokens — enables token theft for any connected service
Record summary
CVE-2026-70478 has a selected CVSS score of 9.2 (critical).
Description
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the POST /api/v1/oauth2-credential/refresh/:credentialId endpoint is included in WHITELIST_URLS and requires no authentication. The endpoint decrypts the stored credential, sends a refresh request to the configured OAuth provider with the client secret and refresh token, and returns the refreshed access_token in the response body. An attacker with a credential ID can use the token to access the victim's connected service and can also exhaust refresh-token quota. This issue is fixed in 3.1.3.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationPoC
AutomatableYes
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated Aug 5, 2026 · Source: CVE List
Affected products and versions
2| Product | Source | Version range | Status |
|---|---|---|---|
FlowiseBrowse FlowiseAI / Flowise | CVE List | < 3.1.2 | affected |
flowiseBrowse npm / flowise | GitHub Advisory | Before 3.1.3 · Fixed in 3.1.3 | affected |
References
2github.comConfirmation
https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-qgvm-j2hm-6m38