CVE-2026-8446: Langflow is affected by security vulnerabilities in Model Context Protocol features

Published Jul 31, 2026
·
Updated

IBM Langflow OSS 1.0.0 through 1.10.3 contain an authentication bypass vulnerability in the Model Context Protocol (MCP) composer endpoint when mcpcomposerenabled=true (default) and projects are configured with authtype=oauth .

Other sources

Langflow OSS contain an authentication bypass vulnerability in the Model Context Protocol (MCP) composer endpoint when

— IBM

Affected Software

2 affected components
IBM Langflow OSS<=1.0.0-1.10.3
Langflow Langflow>=1.0.0<1.11.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade IBM Langflow OSS to a version that resolves this vulnerability.

    Fixed in 1.11.0
  2. Configuration

    If mcp_composer_enabled=true (default) and projects use auth_type=oauth, change mcp_composer_enabled to false to disable the MCP composer endpoint until you can upgrade.

    IBM Langflow OSS mcp_composer_enabled = true

Event History

Jul 31, 2026
CVE Published
via IBM·12:00 AM
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software
Aug 5, 2026
CVE Published
via MITRE·04:27 PM
Data Sourced
via MITRE·04:27 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·05:16 PM
DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

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Frequently Asked Questions

1

What is the severity of CVE-2026-8446?

The severity of CVE-2026-8446 is rated as high, with a score of 7.5.

2

What vulnerability is described in CVE-2026-8446?

CVE-2026-8446 describes an authentication bypass vulnerability in the Model Context Protocol features of IBM Langflow OSS.

3

Can CVE-2026-8446 be exploited remotely?

Yes, CVE-2026-8446 can be exploited remotely as it allows unauthorized access through insecure configurations.

4

How do I fix CVE-2026-8446?

To fix CVE-2026-8446, disable the mcp_composer_enabled feature or reconfigure projects to use a different authentication type than oauth.

5

Which versions of IBM Langflow OSS are affected by CVE-2026-8446?

IBM Langflow OSS versions 1.0.0 through 1.10.3 are affected by CVE-2026-8446.

Company

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