IBM Langflow OSS <=1.9.6: Unauth Access via MCP Streamable Endpoint Auth Flaw
CVE-2026-7663 Published on June 30, 2026

Unauthenticated Cross-User MCP Resource Access and Tool Execution via Streamable Transport Authorization Bypass
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.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-7663 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
NONE

Weakness Type

What is an AuthZ Vulnerability?

The software does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.

CVE-2026-7663 has been classified to as an AuthZ vulnerability or weakness.


Products Associated with CVE-2026-7663

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IBM Langflow Oss
 

Affected Versions

IBM Langflow OSS: