langflow-ai Langflow up to 1.9.0 MCP Connection read_resource improper authorization

Summaryinfo

A vulnerability was found in langflow-ai Langflow up to 1.9.0. It has been rated as problematic. Affected is the function read_resource of the component MCP Connection. The manipulation leads to improper authorization. This vulnerability is traded as CVE-2026-105699. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in langflow-ai Langflow up to 1.9.0. It has been rated as problematic. This issue affects the function read_resource of the component MCP Connection. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality. The summary by CVE is:

Langflow is a tool for building and deploying AI-powered agents and workflows. From 1.6.8 until 1.9.1, Langflow authenticated access to the project identifier in a project-scoped MCP connection but did not authorize the resource URI supplied to resources/read. read_resource forwarded the attacker-controlled URI to handle_read_resource, which parsed a flow_id and filename and called storage_service.get_file without verifying that the flow belonged to the authenticated user or current project. A user with access to any project-scoped MCP endpoint could therefore request another user's flow-backed file, while global handle_list_resources and handle_list_tools behavior could disclose flow and file identifiers that made targeting easier. The vulnerability disclosed uploaded documents, structured data, prompts, and other private flow artifacts across tenants but did not modify victim files or stored flows. This issue is fixed in version 1.9.1.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-105699 since 10/05/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 1.9.1 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• langflow-ai

Name

• Langflow

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9.0

Website

• Product: https://github.com/langflow-ai/langflow/

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