---
id: CVE-2026-105699
title: Langflow is a tool for building and deploying AI-powered agents and workflows
summary: >-
  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 supp…
severity: high
cvss: 7.1
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-639
vendor: langflow-ai
product: langflow
affected:
  - 'langflow >= 1.6.8, <= 1.9.0'
published: '2026-10-05'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T21:16:35.410'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-105699'
references:
  - url: >-
      https://github.com/langflow-ai/langflow/commit/b8fe970493fd5fb2e1fc71dfccc79f90b76058fa
    label: security-advisories@github.com
  - url: >-
      https://github.com/langflow-ai/langflow/commit/f0fd436fe9829192ee550e6cb46961a01dd37032
    label: security-advisories@github.com
  - url: 'https://github.com/langflow-ai/langflow/pull/12818'
    label: security-advisories@github.com
  - url: 'https://github.com/langflow-ai/langflow/releases/tag/v1.9.1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/langflow-ai/langflow/security/advisories/GHSA-4hmc-cfm3-w43c
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-05T21:34:25.114Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.