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.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m837-xvxr-vqwg	Mitigation Vendor Advisory
https://www.vulncheck.com/advisories/flowise-hardcoded-cors-wildcard-in-tts-endpoint	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*

History

06 Jul 2026, 15:49

Type	Values Removed	Values Added
CPE		cpe:2.3:a:flowiseai:flowise::::::::
First Time		Flowiseai flowise Flowiseai
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 6.5
References	~~() https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m837-xvxr-vqwg -~~	() https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m837-xvxr-vqwg - Mitigation, Vendor Advisory
References	~~() https://www.vulncheck.com/advisories/flowise-hardcoded-cors-wildcard-in-tts-endpoint -~~	() https://www.vulncheck.com/advisories/flowise-hardcoded-cors-wildcard-in-tts-endpoint - Third Party Advisory

30 Jun 2026, 23:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-30 23:17

Updated : 2026-07-06 15:49

NVD link : CVE-2026-56277

Mitre link : CVE-2026-56277

CVE.ORG link : CVE-2026-56277

JSON object : View

Products Affected

flowiseai

flowise

CWE

CWE-346

Origin Validation Error

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