Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Flowiseai | Flowise | < 3.1.2 |
Related Weaknesses (CWE)
References
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m837-xvxr-vqwgMitigationVendor Advisory
- https://www.vulncheck.com/advisories/flowise-hardcoded-cors-wildcard-in-tts-endpThird Party Advisory
FAQ
What is CVE-2026-56277?
CVE-2026-56277 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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...
How severe is CVE-2026-56277?
CVE-2026-56277 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-56277?
Check the references section above for vendor advisories and patch information. Affected products include: Flowiseai Flowise.