IBM Langflow OSS <1.8.4: Unauth MCP Access via Streamable Transport
CVE-2026-7664 Published on June 22, 2026

Unauthenticated Flow Execution via Webhook Endpoint in Langflow OSS
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.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-7664 is exploitable 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 be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.

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

Weakness Type

What is an authentification Vulnerability?

When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.

CVE-2026-7664 has been classified to as an authentification vulnerability or weakness.


Products Associated with CVE-2026-7664

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IBM Langflow Oss
 

Affected Versions

IBM Langflow OSS: