CVE-2026-70478 (GCVE-0-2026-70478)

Vulnerability from cvelistv5 – Published: 2026-08-04 19:37 – Updated: 2026-08-05 19:05
VLAI
Title
Flowise: Unauthenticated OAuth2 token refresh endpoint returns access tokens — enables token theft for any connected service
Summary
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.
Severity
9.2 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-05 19:05 UTC
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 8086 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
FlowiseAI Flowise Affected: < 3.1.2
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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