CVE-2026-56277 | Flowise before 3.1.2 sets Access-Control-Allow-Origin to a h… | CVSS 6.9 MEDIUM

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.

Metadata

CVE ID: CVE-2026-56277
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-20 01:51 UTC
Published: 2026-06-30 22:08 UTC
Last updated: 2026-06-30 22:08 UTC
Primary CWE: CWE-346
Origin Validation Error
Vendor / Product: Flowise / Flowise
Sources: cve.org · NVD

Severity & Metrics

6.9 MEDIUM CVSS 4.0

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

Affected products (1)

Vendor	Product	Platform	Versions
Flowise	Flowise	—	0 < 3.1.2, 3.1.2

Weakness (CWE)

CWE	Source	Description
CWE-346	cna	Origin Validation Error

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.9	MEDIUM	4.0	cna	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

References (2)

GitHub Security Advisory (GHSA-m837-xvxr-vqwg) https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m837-xvxr-vqwg
VulnCheck Advisory: Flowise - Hardcoded CORS Wildcard in TTS Endpoint https://www.vulncheck.com/advisories/flowise-hardcoded-cors-wildcard-in-tts-endpoint