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CVE-2026-7664— Unauthenticated Flow Execution via Webhook Endpoint in Langflow OSS

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公司的低代码开发平台。 IBM Langflow OSS存在授权问题漏洞，该漏洞源于Streamable MCP transport endpoint中授权执行不当，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 9.8 · Critical EPSS 0.50% · P42

Affected Version Matrix 1

VendorProduct Version RangeStatus
IBM Langflow OSS 1.0.0≤ 1.8.4 affected
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I. Basic Information for CVE-2026-7664

Vulnerability Information
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Vulnerability Title
Unauthenticated Flow Execution via Webhook Endpoint in Langflow OSS
Source: CVE Program / CVE List V5
Vulnerability Description
IBM Langflow OSS 1.0.0 through 1.8.4 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:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
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公司的低代码开发平台。 IBM Langflow OSS存在授权问题漏洞，该漏洞源于Streamable MCP transport endpoint中授权执行不当，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 ~ 1.8.4 cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-7664

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III. Intelligence Information for CVE-2026-7664

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Other References for CVE-2026-7664 (1)

Same Patch Batch · IBM · 2026-06-22 · 21 CVEs total

CVE-2026-10561 10.0 CRITICAL Unauthenticated Remote Code Execution in Langflow OSS PythonREPLComponent via Builtins Inj
CVE-2026-12628 9.1 CRITICAL Hardcoded credential in the IBM Storage Protect Snapshot For Windows leads to unauthorized
CVE-2026-9072 8.1 HIGH WebSphere Application Server Remote Code Execution
CVE-2026-9071 7.5 HIGH IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by
CVE-2026-8858 7.5 HIGH WebSphere Application Server Remote Code Execution
CVE-2026-9006 7.4 HIGH IBM WebSphere Application Server is affected by server-side request forgery
CVE-2026-8646 7.4 HIGH IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by
CVE-2024-54178 6.5 MEDIUM Multiple vulnerabilities affect IBM Db2® on Cloud Pak for Data, and Db2 Warehouse on Cloud
CVE-2024-51454 6.5 MEDIUM IBM Engineering Lifecycle Management - Engineering Workflow Management is impacted by vuln
CVE-2026-8059 6.1 MEDIUM Multiple Vulnerabilities in IBM Datacap
CVE-2026-7253 6.0 MEDIUM IBM Sterling File Gateway SQL Injection
CVE-2025-2669 6.0 MEDIUM Multiple vulnerabilities affect IBM Db2® on Cloud Pak for Data, and Db2 Warehouse on Cloud
CVE-2026-9320 5.9 MEDIUM IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by
CVE-2026-10852 5.9 MEDIUM Websphere Application Server is Affected By a Denial of Service
CVE-2026-8636 5.5 MEDIUM Multiple Vulnerabilities in IBM Datacap
CVE-2026-11372 5.4 MEDIUM IBM TRIRIGA Cross-Site Scripting Vulnerability
CVE-2025-33128 5.4 MEDIUM IBM Engineering Lifecycle Management - Engineering Workflow Management is impacted by vuln
CVE-2023-33854 5.3 MEDIUM Multiple vulnerabilities affect IBM Db2® on Cloud Pak for Data, and Db2 Warehouse on Cloud
CVE-2026-9610 2.3 LOW Multiple Vulnerabilities in IBM Datacap
CVE-2026-10845 IBM WebSphere Application Server is affected by an authentication bypass vulnerability

IV. Related Vulnerabilities

Same product: Langflow OSS
Same vendor: IBM
Same weakness: CWE-287