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CVE-2026-70478— Flowise: Unauthenticated OAuth2 token refresh endpoint returns access tokens — enables token theft for any connected service

Quick assessment

Affected
FlowiseAI Flowise
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FlowiseAI Flowise是FlowiseAI公司开源的一个用于轻松构建 LLM 应用程序的工具。 FlowiseAI Flowise 3.1.3之前版本存在信息泄露漏洞，该漏洞源于/api/v1/oauth2-credential/refresh/:credentialId端点无需身份验证即可解密存储的凭据并返回访问令牌，可能导致攻击者利用凭据ID访问受害者已连接的服务或耗尽刷新令牌配额。

CVSS 9.2 · Critical EPSS 0.61% · P48

Affected Version Matrix 1

VendorProduct Version RangeStatus
FlowiseAI Flowise < 3.1.2 affected
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I. Basic Information for CVE-2026-70478

Vulnerability Information
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Vulnerability Title
Flowise: Unauthenticated OAuth2 token refresh endpoint returns access tokens — enables token theft for any connected service
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
FlowiseAI Flowise 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FlowiseAI Flowise是FlowiseAI公司开源的一个用于轻松构建 LLM 应用程序的工具。 FlowiseAI Flowise 3.1.3之前版本存在信息泄露漏洞，该漏洞源于/api/v1/oauth2-credential/refresh/:credentialId端点无需身份验证即可解密存储的凭据并返回访问令牌，可能导致攻击者利用凭据ID访问受害者已连接的服务或耗尽刷新令牌配额。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FlowiseAI Flowise < 3.1.2 -

II. Public POCs for CVE-2026-70478

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Qwen3.6-35B-A3B · 6827 chars
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III. Intelligence Information for CVE-2026-70478

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Vendor Advisories for CVE-2026-70478 (1)

Same Patch Batch · FlowiseAI · 2026-08-04 · 22 CVEs total

CVE-2026-70477 9.5 CRITICAL Flowise: CSV Agent Prompt Injection Remote Code Execution Vulnerability
CVE-2026-70470 9.5 CRITICAL Flowise: Pyodide validator Unicode homoglyph bypass leads to RCE
CVE-2026-69254 9.4 CRITICAL Flowise: RCE via NodeVM Sandbox Escape in executeJavaScriptCode() nodeVMOptions Override
CVE-2026-69259 9.4 CRITICAL Flowise RCE via SQLite Record Manager Node
CVE-2026-69256 9.4 CRITICAL Flowise: Remote Code Execution Vulnerability in CSVAgent
CVE-2026-69264 9.4 CRITICAL Flowise: RCE via CSVAgent csvFile data URI base64 segment is interpolated into Python sour
CVE-2026-69255 9.2 CRITICAL Flowise: CSV Agent Remote Code Execution via Pyodide Code Injection — Root Shell Verified
CVE-2026-69251 9.0 CRITICAL Flowise RCE via TypeORM DataSource
CVE-2026-69253 9.0 CRITICAL Flowise Sandbox Escape to RCE
CVE-2026-69258 8.8 HIGH Flowise: Unauthenticated Property Injection into Flow Execution Context via Ungated `overr
CVE-2026-69263 8.7 HIGH Flowise: CVE-2025-8943 Patch Bypass: npm_config_yes bypasses MCP environment variable bloc
CVE-2026-69250 8.5 HIGH Flowise: Unauthenticated OAuth2 Refresh Enables Non-Blind SSRF and Secret Exfiltration
CVE-2026-70473 8.3 HIGH Flowise: Information Disclosure in GET /api/v1/upsert-history returns the entire server-wi
CVE-2026-70476 8.3 HIGH Flowise: Broken Access Control in Stripe Subscription Endpoints Allows Cross-Tenant Billin
CVE-2026-69257 7.6 HIGH Flowise: SSRF Protection Bypass via IPv4-Mapped IPv6 Addresses
CVE-2026-70474 7.6 HIGH Flowise: Cross-Workspace OAuth2 Credential Metadata Leak
CVE-2026-69252 7.2 HIGH Flowise: Missing authorization on `/api/v1/files` allows low-privileged API keys to list a
CVE-2026-69262 7.1 HIGH Flowise: `DELETE /api/v1/chatflows/:id` does not validate resource type, allowing `agentfl
CVE-2026-70471 7.1 HIGH Flowise: RBAC Bypass Leading to Unauthorized Workspace Variables Disclosure
CVE-2026-70472 7.1 HIGH Flowise: Cross-workspace credential IDOR in openai-assistants-vector-store

Showing top 20 of 22 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Flowise
Same vendor: FlowiseAI
Same weakness: CWE-200

V. Comments for CVE-2026-70478

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