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CVE-2026-7663— Unauthenticated Cross-User MCP Resource Access and Tool Execution via Streamable Transport Authorization Bypass

Quick assessment

Affected
IBM Langflow OSS
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.

IBM Langflow OSS是美国IBM公司的一个开源的低代码可视化AI工作流构建工具，它让开发者能通过拖拽组件的方式快速搭建、部署和迭代AI智能体与RAG应用，同时支持用Python进行深度定制以集成企业系统。 IBM Langflow OSS 1.0.0版本至1.9.6版本存在授权问题漏洞，该漏洞源于Streamable MCP传输端点授权执行不当，可能导致未经身份验证的攻击者访问受保护的MCP项目资源并执行MCP操作。

CVSS 9.1 · Critical EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
IBM Langflow OSS 1.0.0≤ 1.9.6 affected
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I. Basic Information for CVE-2026-7663

Vulnerability Information
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Vulnerability Title
Unauthenticated Cross-User MCP Resource Access and Tool Execution via Streamable Transport Authorization Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
IBM Langflow OSS 1.0.0 through 1.9.6 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
IBM Langflow OSS 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
IBM Langflow OSS是美国IBM公司的一个开源的低代码可视化AI工作流构建工具，它让开发者能通过拖拽组件的方式快速搭建、部署和迭代AI智能体与RAG应用，同时支持用Python进行深度定制以集成企业系统。 IBM Langflow OSS 1.0.0版本至1.9.6版本存在授权问题漏洞，该漏洞源于Streamable MCP传输端点授权执行不当，可能导致未经身份验证的攻击者访问受保护的MCP项目资源并执行MCP操作。
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
IBM Langflow OSS 1.0.0 ~ 1.9.6 cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-7663

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III. Intelligence Information for CVE-2026-7663

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Vendor Advisories for CVE-2026-7663 (1)

Same Patch Batch · IBM · 2026-06-30 · 43 CVEs total

CVE-2026-10134 10.0 CRITICAL Unauthenticated Server-Side RCE via PythonCodeStructuredTool in Public Flows
CVE-2026-7873 9.9 CRITICAL Code Injection Vulnerability in Code Validation Endpoint
CVE-2026-7871 9.8 CRITICAL Insecure Deserialization in Redis Cache Backend
CVE-2026-7803 9.8 CRITICAL Flow Validation Bypass via Empty Component Type Field
CVE-2026-10109 9.8 CRITICAL IBM® Db2® is vulnerable to remote code execution due to improper pre-auth DRDA handshake h
CVE-2026-10140 9.6 CRITICAL Cross-Tenant API Key Reuse and Billing Fraud in Langflow Voice Mode Subsystem
CVE-2026-11708 9.3 CRITICAL IBM WebSphere Application Server is affected by a cross-site scripting vulnerability
CVE-2026-11712 9.3 CRITICAL IBM WebSphere Application Server is affected by a cross-site scripting vulnerability
CVE-2026-7874 9.1 CRITICAL Weak Cryptographic Key Derivation Exposed All Stored Credentials
CVE-2026-11594 8.5 HIGH IBM WebSphere Application Server is affected by multiple cross-site scripting vulnerabilit
CVE-2026-11714 8.5 HIGH IBM WebSphere Application Server Liberty is affected by an authorization bypass vulnerabil
CVE-2026-10129 8.5 HIGH SSRF via HTTP Redirect Following in Langflow API Request Component
CVE-2026-10560 8.2 HIGH Unauthenticated Access to Private Flow Build Events and Cancellation in Langflow OSS
CVE-2026-10564 8.2 HIGH SSRF Vulnerability in Langflow OSS Legacy Components Bypasses Protection
CVE-2025-36359 8.1 HIGH IBM DevOps Loop is susceptible to an Insufficient Session Expiration vulnerability.
CVE-2026-13449 7.6 HIGH XXE attack in IBM Business Automation Manager Open Editions
CVE-2026-13759 7.5 HIGH IBM WebSphere eXtreme Scale is affected by Insecure Deserilization
CVE-2026-13772 7.5 HIGH IBM WebSphere eXtreme Scale's OQL is affected by remote code execution
CVE-2026-11541 7.4 HIGH Inconsistent Interpretation of HTTP Requests in CICS Transaction Gateway for Multiplatform
CVE-2026-11806 7.2 HIGH IBM WebSphere Application Server Liberty is affected by a an arbitrary file read vulnerabi

Showing top 20 of 43 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Langflow OSS
Same vendor: IBM
Same weakness: CWE-285

V. Comments for CVE-2026-7663

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