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CVE-2026-56277— Flowise - Hardcoded CORS Wildcard in TTS Endpoint

Quick assessment

Affected
Flowise Flowise
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FlowiseAI Flowise是FlowiseAI公司开源的一个用于轻松构建 LLM 应用程序的工具。 FlowiseAI Flowise 3.1.2之前版本存在输入验证错误漏洞，该漏洞源于在文本转语音（TTS）生成端点中将Access-Control-Allow-Origin设置为硬编码通配符，绕过了服务器的CORS配置，允许任何网页利用存储的凭据触发TTS生成，从而可能导致跨源凭据滥用。

AI Predicted 6.5 Difficulty: Trivial EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process

Affected Version Matrix 2

VendorProduct Version RangeStatus
Flowise Flowise < 3.1.2 affected
3.1.2 unaffected
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I. Basic Information for CVE-2026-56277

Vulnerability Information
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Vulnerability Title
Flowise - Hardcoded CORS Wildcard in TTS Endpoint
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
FlowiseAI Flowise 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FlowiseAI Flowise是FlowiseAI公司开源的一个用于轻松构建 LLM 应用程序的工具。 FlowiseAI Flowise 3.1.2之前版本存在输入验证错误漏洞，该漏洞源于在文本转语音（TTS）生成端点中将Access-Control-Allow-Origin设置为硬编码通配符，绕过了服务器的CORS配置，允许任何网页利用存储的凭据触发TTS生成，从而可能导致跨源凭据滥用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Flowise Flowise 0 ~ 3.1.2 -

II. Public POCs for CVE-2026-56277

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III. Intelligence Information for CVE-2026-56277

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Vendor Advisories for CVE-2026-56277 (2)

IV. Related Vulnerabilities

Same product: Flowise
Same vendor: Flowise
Same weakness: CWE-346

V. Comments for CVE-2026-56277

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