{"id":"CVE-2026-41279","aliases":["GHSA-5fw2-mwhh-9947"],"url":"https://o3.security/vulnerability/CVE-2026-41279","summary":"Flowise: Unauthenticated TTS endpoint accepts arbitrary credential IDs — enables API credit abuse via stored credentials","details":"### Summary\n\nThe text-to-speech generation endpoint (`POST /api/v1/text-to-speech/generate`) is whitelisted (no auth) and accepts a `credentialId` directly in the request body. When called without a `chatflowId`, the endpoint uses the provided `credentialId` to decrypt the stored credential (e.g., OpenAI or ElevenLabs API key) and generate speech.\n\n### Root Cause\n\n```typescript\n// packages/server/src/controllers/text-to-speech/index.ts:58-64\n} else {\n    // Use TTS config from request body\n    provider = bodyProvider\n    credentialId = bodyCredentialId  // ← attacker-controlled credential ID\n    voice = bodyVoice\n    model = bodyModel\n}\n```\n\n### Docker Validation\n\n`POST /api/v1/text-to-speech/generate` with arbitrary `credentialId` in body: endpoint processes request, sends SSE `tts_start` event, only fails when credential doesn't exist — proves code path runs without authentication.\n\n### Impact\n\n- Use victim's API keys (OpenAI, ElevenLabs, Azure, Google) without authorization\n- Burn API credits on the victim's account\n- Generate unlimited speech content at victim's expense\n- Combined with credential ID leak from Finding 2, this is trivially exploitable\n\n### Suggested Fix\n\nRemove the TTS endpoint from `WHITELIST_URLS` or validate that the credential belongs to the chatflow being used:\n\n```typescript\n// Only allow credentialId when it matches the chatflow's TTS configuration\nif (!chatflowId) {\n    return res.status(401).json({ message: 'Authentication required' })\n}\n```\n\n---\n\n## References\n\n- `packages/server/src/controllers/text-to-speech/index.ts` lines 10-162\n- `packages/server/src/utils/constants.ts` line 41 (whitelist entry)\n\n## Credits\n- Shinobi Security - https://github.com/shinobisecurity","published":"2026-04-23T19:53:15.237Z","modified":"2026-10-28T02:30:26.154200563Z","cvss":null,"epss":{"score":0.00261,"percentile":0.18076,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"flowise","fixedVersion":"3.1.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41279.json"},{"type":"ADVISORY","url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-5fw2-mwhh-9947"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41279"},{"type":"PACKAGE","url":"https://github.com/FlowiseAI/Flowise"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:26.154200563Z"}}