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Medium

Flowise: Hardcoded CORS wildcard on TTS endpoint enables cross-origin credential abuse from any webpage

  • Disclosed: 20.05.2026
  • Updated: 11.10.2026 10:22

Summary

The TTS generation endpoint sets Access-Control-Allow-Origin: * as a hardcoded response header, independent of the server's CORS configuration. This enables any webpage to make cross-origin requests to generate speech using stored credentials.

Root Cause

ts
// packages/server/src/controllers/text-to-speech/index.ts:83
res.setHeader('Access-Control-Allow-Origin', '*')
res.setHeader('Access-Control-Allow-Headers', 'Cache-Control')

Impact

  • Cross-origin credential abuse — any webpage can trigger TTS using stored credentials
  • Bypasses the server's CORS policy (getCorsOptions()) which is otherwise restrictive by default
  • Combined with Finding 3 (TTS credential abuse), enables drive-by credential abuse via malicious webpages

Suggested Fix

Remove the hardcoded CORS wildcard and let the server's CORS middleware handle the headers:

ts
// Remove these lines:
// res.setHeader('Access-Control-Allow-Origin', '*')
// res.setHeader('Access-Control-Allow-Headers', 'Cache-Control')

References

  • packages/server/src/controllers/text-to-speech/index.ts line 83

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
npm package flowise < 3.1.2 3.1.2

References

CVSS score -
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness (CWE)
CWE-942
Platform
npm
Package
flowise
Disclosed
20.05.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-m837-xvxr-vqwg - CC BY 4.0

Vulnerability history: flowise

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (114) in the archive
Total entries
114
First → latest
04.2024 10.2026
Without a fix
16
Exploited in attacks
0

Severity breakdown

  • Critical 28
  • High 62
  • Medium 24

Disclosures per year

Severity:
  1. Flowise Prompt Injection to RCE and SSRF via CSV/Airtable Agent Python Validator Bypass
    Critical CVE-2026-73487 < 3.1.3 3.1.3
  2. Flowise NodeVM sandbox escape via puppeteer allowlist - authenticated RCE and arbitrary file read via Chromium
    Critical CVE-2026-73483 < 3.1.3 3.1.3
  3. Flowise: Unauthenticated OAuth2 token refresh endpoint returns access tokens — enables token theft for any connected service
    Critical CVE-2026-70478 < 3.1.3 3.1.3
  4. Flowise: CSV Agent Prompt Injection Remote Code Execution Vulnerability
    Critical CVE-2026-70477 < 3.1.3 3.1.3
  5. Flowise: Broken Access Control in Stripe Subscription Endpoints Allows Cross-Tenant Billing Manipulation
    High CVE-2026-70476 < 3.1.3 3.1.3
  6. Flowise: Missing Authorization on Execution Update Endpoint
    High CVE-2026-70475 < 3.1.3 3.1.3
  7. Flowise: Cross-Workspace OAuth2 Credential Metadata Leak
    High CVE-2026-70474 < 3.1.3 3.1.3
  8. Flowise: Information Disclosure in GET /api/v1/upsert-history returns the entire server-wide upsert history
    High CVE-2026-70473 < 3.1.3 3.1.3
  9. Flowise: Cross-workspace credential IDOR in openai-assistants-vector-store
    High CVE-2026-70472 < 3.1.3 3.1.3
  10. Flowise: RCE via CSVAgent csvFile data URI base64 segment is interpolated into Python source without validation
    Critical CVE-2026-69264 < 3.1.3 3.1.3
  11. Flowise: Authenticated arbitrary file write in the `S3 Directory` document loader via unsanitized S3 object keys
    High ghsa-88pr-878c-24wf < 3.1.3 3.1.3
  12. Flowise: RBAC Bypass Leading to Unauthorized Workspace Variables Disclosure
    High CVE-2026-70471 < 3.1.3 3.1.3
  13. Flowise: Pyodide validator Unicode homoglyph bypass leads to RCE
    Critical CVE-2026-70470 < 3.1.3 3.1.3
  14. Flowise: CVE-2025-8943 Patch Bypass: npm_config_yes bypasses MCP environment variable blocklist (Unauthenticated RCE)
    High CVE-2026-69263 < 3.1.3 3.1.3
  15. Flowise: `DELETE /api/v1/chatflows/:id` does not validate resource type, allowing `agentflows:delete` and `chatflows:delete` to delete each other’s flow type
    High CVE-2026-69262 < 3.1.3 3.1.3
  16. Flowise RCE via SQLite Record Manager Node
    Critical CVE-2026-69259 < 3.1.3 3.1.3
  17. Flowise: Unauthenticated Property Injection into Flow Execution Context via Ungated `overrideConfig` Spread in Prediction API
    High CVE-2026-69258 < 3.1.3 3.1.3
  18. Flowise: SSRF Protection Bypass via IPv4-Mapped IPv6 Addresses
    High CVE-2026-69257 < 3.1.3 3.1.3
  19. Flowise: Remote Code Execution Vulnerability in CSVAgent
    Critical CVE-2026-69256 < 3.1.3 3.1.3
  20. Flowise: CSV Agent Remote Code Execution via Pyodide Code Injection — Root Shell Verified
    Critical CVE-2026-69255 < 3.1.3 3.1.3
  21. Flowise: RCE via NodeVM Sandbox Escape in executeJavaScriptCode() nodeVMOptions Override
    Critical CVE-2026-69254 < 3.1.3 3.1.3
  22. Flowise Sandbox Escape to RCE
    Critical CVE-2026-69253 < 3.1.3 3.1.3
  23. Flowise: Missing authorization on `/api/v1/files` allows low-privileged API keys to list and delete files across workspaces within the same organization
    High CVE-2026-69252 < 3.1.3 3.1.3
  24. Flowise RCE via TypeORM DataSource
    Critical CVE-2026-69251 < 3.1.3 3.1.3
  25. Flowise: Unauthenticated OAuth2 Refresh Enables Non-Blind SSRF and Secret Exfiltration
    High CVE-2026-69250 < 3.1.3 3.1.3
  26. Flowise: Hardcoded CORS wildcard on TTS endpoint enables cross-origin credential abuse from any webpage this entry
    Medium CVE-2026-56277 < 3.1.2 3.1.2
  27. FlowiseAI: Evaluator create+update mass-assignment allows cross-workspace evaluator takeover
    High · 8.8 CVE-2026-46480 < 3.1.2 3.1.2
  28. FlowiseAI: Evaluation create+update mass-assignment allows cross-workspace evaluation takeover
    High · 8.8 CVE-2026-46479 < 3.1.2 3.1.2
  29. FlowiseAI: DatasetRow create+update mass-assignment allows cross-workspace row takeover
    High · 8.8 CVE-2026-46478 < 3.1.2 3.1.2
  30. FlowiseAI: Dataset create+update mass-assignment allows cross-workspace dataset takeover
    High · 8.8 CVE-2026-46477 < 3.1.2 3.1.2
  31. FlowiseAI: CustomTemplate create+update mass-assignment allows cross-workspace template takeover
    High CVE-2026-46476 < 3.1.2 3.1.2
  32. FlowiseAI: Assistant create+update mass-assignment allows cross-workspace assistant takeover
    High · 8.8 CVE-2026-46475 < 3.1.2 3.1.2
  33. FlowiseAI: Vector Store No Permission Checks
    High · 8.8 CVE-2026-46444 < 3.1.2 3.1.2
  34. FlowiseAI Vulnerable to Credential Data Leak
    High CVE-2026-46443 < 3.1.2 3.1.2
  35. FlowiseAI: Authenticated Host RCE via POST /api/v1/node-custom-function and NodeVM Sandbox Escape
    Critical CVE-2026-46442 < 3.1.2 3.1.2
  36. FlowiseAI has Mass Assignment in Assistant Update Endpoint that Allows Cross-Workspace Resource Reassignment
    High CVE-2026-46441 < 3.1.2 3.1.2
  37. Flowise has an MCP Security Bypass that Enables RCE
    High CVE-2026-56274 < 3.1.2 3.1.2
  38. FlowiseAI Exposes Basic Auth Credentials via API
    High · 7.5 CVE-2026-46440 < 3.1.2 3.1.2
  39. FlowiseAI has Mass Assignment in Chatflow Update Endpoint that Allows Cross-Workspace AgentFlow Reassignment
    High CVE-2026-42863 < 3.1.2 3.1.2
  40. FlowiseAI has Mass Assignment in Tool Update Endpoint that Allows Cross-Workspace Resource Reassignment
    High CVE-2026-42862 < 3.1.2 3.1.2
  41. FlowiseAI has Mass Assignment in Variable Update Endpoint that Allows Cross-Workspace Resource Reassignment
    High CVE-2026-42861 < 3.1.2 3.1.2
  42. Flowise: CSV Agent Prompt Injection Remote Code Execution Vulnerability
    Critical · 9.8 CVE-2026-41264 < 3.1.0 3.1.0
  43. Flowise: Airtable_Agent Code Injection Remote Code Execution Vulnerability
    Critical · 9.8 CVE-2026-41265 < 3.1.0 3.1.0
  44. Flowise: Unauthenticated TTS endpoint accepts arbitrary credential IDs — enables API credit abuse via stored credentials
    High · 7.5 CVE-2026-41279 < 3.1.0 3.1.0
  45. Flowise: Public chatflow endpoints return unsanitized flowData including plaintext API keys, passwords, and credential IDs
    High · 7.5 CVE-2026-41278 < 3.1.0 3.1.0
  46. Flowise: Mass Assignment in DocumentStore Create Endpoint Leads to Cross-Workspace Object Takeover (IDOR)
    High · 8.8 CVE-2026-41277 < 3.1.0 3.1.0
  47. Flowise: resetPassword Authentication Bypass Vulnerability
    High · 9.8 CVE-2026-41276 < 3.1.0 3.1.0
  48. Flowise: Cypher Injection in GraphCypherQAChain
    High CVE-2026-41274 < 3.1.0 3.1.0
  49. Flowise: Password Reset Link Sent Over Unsecured HTTP
    High · 7.5 CVE-2026-41275 < 3.1.0 3.1.0
  50. Flowise: Unauthenticated OAuth 2.0 Access Token Disclosure via Public Chatflow in Flowise
    High · 8.2 CVE-2026-41273 < 3.1.0 3.1.0
  51. Flowise: APIChain Prompt Injection SSRF in GET/POST API Chains
    High · 7.1 CVE-2026-41271 < 3.1.0 3.1.0
  52. Flowise: SSRF Protection Bypass (TOCTOU & Default Insecure)
    High · 7.1 CVE-2026-41272 < 3.1.0 3.1.0
  53. Flowise: SSRF Protection Bypass via Unprotected Built-in HTTP Modules in Custom Function Sandbox
    High · 7.1 CVE-2026-41270 < 3.1.0 3.1.0
  54. Flowise: File Upload Validation Bypass in createAttachment
    High · 7.1 CVE-2026-41269 < 3.1.0 3.1.0
  55. Flowise: Parameter Override Bypass Remote Command Execution
    High · 7.7 CVE-2026-41268 < 3.1.0 3.1.0
  56. Flowise: Sensitive Data Leak in public-chatbotConfig
    High · 7.5 CVE-2026-41266 < 3.1.0 3.1.0
  57. Flowise: Improper Mass Assignment in Account Registration Enables Unauthorized Organization Association
    High · 8.1 CVE-2026-41267 < 3.1.0 3.1.0
  58. Flowise: Code Injection in CSVAgent leads to Authenticated RCE
    Critical · 8.8 CVE-2026-41137 < 3.1.0 3.1.0
  59. Flowise: Remote code execution vulnerability in AirtableAgent.ts caused by lack of input verification when using `Pandas`.
    High · 8.3 CVE-2026-41138 < 3.1.0 3.1.0
  60. Flowise: Authenticated RCE Via MCP Adapters
    Critical · 9.9 CVE-2026-40933 < 3.1.0 3.1.0
  61. Flowise affected by Server-Side Request Forgery (SSRF) in HTTP Node Leading to Internal Network Access
    High · 7.1 CVE-2026-31829 < 3.0.13 3.0.13
  62. Flowise Missing Authentication on NVIDIA NIM Endpoints
    High CVE-2026-30824 < 3.0.13 3.0.13
  63. Flowise has IDOR leading to Account Takeover and Enterprise Feature Bypass via SSO Configuration
    High · 8.8 CVE-2026-30823 < 3.0.13 3.0.13
  64. Flowise Allows Mass Assignment in `/api/v1/leads` Endpoint
    High · 7.7 CVE-2026-30822 < 3.0.13 3.0.13
  65. Flowise has Arbitrary File Upload via MIME Spoofing
    High CVE-2026-30821 < 3.0.13 3.0.13
  66. Flowise has Authorization Bypass via Spoofed x-request-from Header
    High CVE-2026-30820 < 3.0.13 3.0.13
  67. Flowise has Authentication Bypass Using Unprotected Registration Endpoint (/register)
    High CVE-2025-71327 = 3.0.1 no fix
  68. Flowise Fails to Invalidate Existing Sessions After Password Changes
    High · 8.1 CVE-2025-71335 < 3.0.10 3.0.10
  69. Flowise: Authenticated Command Execution and Sandbox Bypass via Puppeteer and Playwright Packages
    High CVE-2025-34267 >= 3.0.1, < 3.0.8 3.0.8
  70. Flowise is vulnerable to arbitrary file exposure through its ReadFileTool
    High · 7.7 ghsa-j44m-5v8f-gc9c < 3.0.8 3.0.8
  71. Flowise is vulnerable to arbitrary file write through its WriteFileTool
    Critical · 9.9 CVE-2025-61913 < 3.0.8, < 3.0.8 3.0.8
  72. FlowiseAI/Flosise has File Upload vulnerability
    High · 8.3 CVE-2025-61687 >= 3.0.7, < 3.0.8 3.0.8
  73. Flowise vulnerable to RCE via Dynamic function constructor injection
    Critical · 9.8 CVE-2025-55346 <= 2.2.7-patch.1 no fix
  74. Flowise is vulnerable to stored XSS via "View Messages" allows credential theft in FlowiseAI admin panel
    Critical · 9.3 CVE-2025-50538 < 3.0.8 3.0.8
  75. Flowise has unsandboxed remote code execution via Custom MCP
    High CVE-2025-71336 >= 2.2.7-patch.1, < 3.0.6 3.0.6
  76. Flowise has arbitrary file access due to missing chat flow id validation
    Critical · 9.8 CVE-2025-71334 >= 2.2.8, < 3.0.6 3.0.6
  77. Flowise has an Arbitrary File Read
    Critical · 9.1 CVE-2025-71324 >= 3.0.5, < 3.0.6 3.0.6
  78. Flowise has Remote Code Execution vulnerability
    Critical · 10.0 CVE-2025-59528 >= 3.0.5, < 3.0.6 3.0.6
  79. FlowiseAI/Flowise has Server-Side Request Forgery (SSRF) vulnerability
    High · 7.5 CVE-2025-59527 >= 3.0.5, < 3.0.6 3.0.6
  80. FlowiseAI Pre-Auth Arbitrary Code Execution
    Critical · 9.1 CVE-2025-57164 >= 3.0.5, < 3.0.6 3.0.6
Show more (11) Showing 80 of 91

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