CVE-2026-41278: Flowise: Public chatflow endpoints return unsanitized flowData including plaintext API keys, passwords, and credential IDs

Summary

The GET /api/v1/public-chatflows/:id endpoint returns the full chatflow object without sanitization for public chatflows. Docker validation revealed this is worse than initially assessed: the sanitizeFlowDataForPublicEndpoint function does NOT exist in the released v3.0.13 Docker image. Both public-chatflows AND public-chatbotConfig return completely raw flowData including credential IDs, plaintext API keys, and password-type fields.

Root Cause

// packages/server/src/controllers/chatflows/index.ts:218-220
const chatflow = await chatflowsService.getChatflowById(req.params.id)
if (!chatflow) return res.status(StatusCodes.NOT_FOUND).json(...)
if (chatflow.isPublic) return res.status(StatusCodes.OK).json(chatflow) // ← NO sanitization!

Docker Validation (v3.0.13)

Created public chatflow with credential IDs and passwords in flowData:

{
  "flowData": "{\"nodes\":[{\"data\":{\"credential\":\"e92a39bf-...\",\"inputs\":{\"password\":\"sk-supersecretkey123\",\"apiKey\":\"should-not-leak\"}}}]}"
}

The sanitizeFlowDataForPublicEndpoint function only exists in unreleased HEAD, and even there, only public-chatbotConfig calls it — public-chatflows never does.

Impact

• Credential IDs leaked — enables OAuth2 token theft chain (Finding 1)
• Plaintext API keys and passwords leaked — direct third-party account compromise
• Node configurations leaked — reveals internal architecture and endpoint URLs
• Both public-chatflows and public-chatbotConfig are affected in the released version

Suggested Fix

Apply sanitization to both public endpoints:

const sanitized = sanitizeFlowDataForPublicEndpoint(chatflow)
return res.status(StatusCodes.OK).json(sanitized)

Ensure the sanitization function strips all credential, password, apiKey, and secretKey fields from flowData.

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References

• packages/server/src/controllers/chatflows/index.ts lines 209-236
• packages/server/src/utils/sanitizeFlowData.ts lines 11-34 (exists only in unreleased HEAD)

Credits

• Shinobi Security - https://github.com/shinobisecurity