CVE-2026-58057— Flowise - Custom MCP Environment Variable Denylist Bypass via Case Sensitivity
Public Exploits 1
ExploitDB · 1 EDB-52623 [webapps]
In-the-Wild Activity Observed github_trending · low
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-58057
Vulnerability Information
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Vulnerability Title
Flowise - Custom MCP Environment Variable Denylist Bypass via Case Sensitivity
Source: CVE Program / CVE List V5
Vulnerability Description
Flowise before 3.1.3 validates Custom MCP stdio environment variables against a denylist using a case-sensitive comparison, so on Windows, where environment names are case-insensitive, supplying 'node_options' bypasses the NODE_OPTIONS denylist entry. An authenticated user who can configure a Custom MCP node can thereby inject NODE_OPTIONS --require and execute arbitrary code in the Flowise server context.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
大小写敏感处理不恰当
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。 Flowise 3.1.3之前版本存在输入验证错误漏洞，该漏洞源于对Windows环境变量的屏蔽列表进行大小写敏感比较，导致通过提供'node_options'绕过NODE_OPTIONS屏蔽列表，从而可能导致经过身份验证的用户在Flowise服务器环境中注入NODE_OPTIONS --require并执行任意代码。
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
II. Public POCs for CVE-2026-58057
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Patches & Fixes for CVE-2026-58057 (1)
Vendor Advisories for CVE-2026-58057 (1)
Proof of Concept for CVE-2026-58057 (1)
- 🔗 exploitarium/flowise-mcp-env-case-bypass-poc at main · bikini/exploitarium · GitHub Read full article exploitthird-party-advisory
IV. Related Vulnerabilities
Same product: Flowise
- CVE-2026-73604
Flowise before 3.1.3 Credential Exposure via API - CVE-2026-73603
Flowise before 3.1.4 Credential Abuse via Text-to-Speech - CVE-2026-73602
Flowise before 3.1.3 Sandbox Escape to RCE - CVE-2026-73601
Flowise before 3.1.3 Remote Code Execution via Custom MCP - CVE-2026-73487
Flowise before 3.1.3 Prompt Injection RCE via CSV Agent
Same vendor: Flowise
- CVE-2026-56271
Flowise - Weak Default JWT Secrets in Authentication Middlew - CVE-2026-56273
Flowise - Path Traversal in Vector Store basePath Parameter - CVE-2026-56278
Flowise - Session Hijacking via Weak Default Express Session - CVE-2026-56277
Flowise - Hardcoded CORS Wildcard in TTS Endpoint - CVE-2025-71336
Flowise - Unsandboxed Remote Code Execution via Custom MCP
Same weakness: CWE-178
- CVE-2026-62673
Grav: .htaccess file extension rules bypass via case variati - CVE-2026-72836
FileBrowser before 2.63.19 Case Sensitivity Authentication B - CVE-2026-73416
jupyterlab: PyPI extension blocklist package-name canonicali - CVE-2026-72721
Discourse: Onebox Domain Blocklist Bypass via Case-Sensitive - CVE-2026-71315
Nuxt route rules silently dropped for mixed-case paths, bypa
V. Comments for CVE-2026-58057
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