Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-56277

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 8.0%
CVSS Severity
CVSS v3 Score 6.5
Products affected by CVE-2026-56277


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