CVE-2026-56277

Description

Flowise before 3.1.2 sets Access-Control-Allow-Origin to a hardcoded wildcard (*) on its text-to-speech (TTS) generation endpoint (packages/server/src/controllers/text-to-speech/index.ts), independent of the server's configured CORS policy. This bypasses the server's otherwise restrictive default CORS configuration (getCorsOptions()) and allows any webpage to make cross-origin requests that trigger TTS generation using stored credentials, enabling drive-by cross-origin credential abuse.

References

• https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m837-xvxr-vqwg
• https://www.vulncheck.com/advisories/flowise-hardcoded-cors-wildcard-in-tts-endpoint