---
title: "CVE-2026-105699: Langflow - Broken Access Control"
description: "Langflow 1.6.8 to 1.9.1 contains a broken access control vulnerability caused by lack of authorization checks on resource URIs in project-scoped MCP connections, letting authenticated users access other users' private flow files, exploit requires authenticated access to any project-scoped MCP endpoint."
url: https://panop.io/threat-heartbeat/CVE-2026-105699/
---

# CVE-2026-105699 Langflow - Broken Access Control

Langflow 1.6.8 to 1.9.1 contains a broken access control vulnerability caused by lack of authorization checks on resource URIs in project-scoped MCP connections, letting authenticated users access other users' private flow files, exploit requires authenticated access to any project-scoped MCP endpoint.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.25% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-105699)

## Details

Type

Broken Access Control

Impact

Information Disclosure

CVSS vector

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

5 October 2026

Updated

15 October 2026

Weakness

[CWE-639](https://cwe.mitre.org/data/definitions/639.html)

## Vendor fix

Update to version 1.9.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-105699](https://nvd.nist.gov/vuln/detail/CVE-2026-105699)
- [https://github.com/langflow-ai/langflow/commit/b8fe970493fd5fb2e1fc71dfccc79f90b76058fa](https://github.com/langflow-ai/langflow/commit/b8fe970493fd5fb2e1fc71dfccc79f90b76058fa)
- [https://github.com/langflow-ai/langflow/commit/f0fd436fe9829192ee550e6cb46961a01dd37032](https://github.com/langflow-ai/langflow/commit/f0fd436fe9829192ee550e6cb46961a01dd37032)
- [https://github.com/langflow-ai/langflow/pull/12818](https://github.com/langflow-ai/langflow/pull/12818)
- [https://github.com/langflow-ai/langflow/releases/tag/v1.9.1](https://github.com/langflow-ai/langflow/releases/tag/v1.9.1)
- [https://github.com/langflow-ai/langflow/security/advisories/GHSA-4hmc-cfm3-w43c](https://github.com/langflow-ai/langflow/security/advisories/GHSA-4hmc-cfm3-w43c)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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