PT-2026-54028 · Flowise · Flowise

Deathspirate · Published 2026-06-30 · Updated 2026-06-30 · CVE-2026-56277

NVD

CVSS v4.0

6.9

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Fix

Origin Validation Error

Weakness Enumeration

CWE-346

Related Identifiers

CVE-2026-56277

Affected Products

Flowise

References · 3

• https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m837-xvxr-vqwg · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-56277 · Security Note
• https://vulncheck.com/advisories/flowise-hardcoded-cors-wildcard-in-tts-endpoint · Note