CVE-2026-73603

Description

Flowise before 3.1.4 fails to validate chatflow visibility in the unauthenticated text-to-speech endpoint, allowing attackers to abuse private chatflow TTS credentials. Unauthenticated attackers can generate unlimited text-to-speech audio using stored OpenAI or ElevenLabs API keys by providing a valid chatflow UUID, incurring costs on the chatflow owner's account.

References

• https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-8gj2-2cvc-6xx7
• https://www.vulncheck.com/advisories/flowise-before-credential-abuse-via-text-to-speech