CVE-2026-56277
Flowise - Hardcoded CORS Wildcard in TTS Endpoint
- State
- Published
- Severity
- 6.9 Medium
- Published
- Jun 30, 2026
- Updated
- Jul 1, 2026
- Reserved
- Jun 20, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
Weaknesses
- CWE-346 Origin Validation Error
Affected Products
| Product | Versions |
|---|---|
FlowiseFlowise |
|
References
- GitHub Security Advisory (GHSA-m837-xvxr-vqwg)vendor-advisory
- VulnCheck Advisory: Flowise - Hardcoded CORS Wildcard in TTS Endpointthird-party-advisory
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