CVE-2026-7664: Unauthenticated Flow Execution via Webhook Endpoint in Langflow OSS

Published Jun 21, 2026
·
Updated

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.

Other sources

Langflow OSS 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.

— IBM

Affected Software

2 affected components
IBM Langflow OSS<=1.0.0-1.8.4
Langflow Langflow>=1.0.0<=1.8.4

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade langflow to a version that resolves this vulnerability.

    Fixed in 1.9.1

Event History

Jun 21, 2026
CVE Published
via IBM·12:00 AM
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software
Jun 22, 2026
CVE Published
via MITRE·02:10 PM
Data Sourced
via MITRE·02:10 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·04:16 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-2026-7664?

CVE-2026-7664 has a critical severity score of 9.8.

2

How do I fix CVE-2026-7664?

To fix CVE-2026-7664, upgrade your IBM Langflow OSS to the latest version that addresses the vulnerability.

3

What impact does CVE-2026-7664 have on my system?

CVE-2026-7664 allows unauthenticated attackers to access protected resources and execute operations within IBM Langflow OSS.

4

Which versions of IBM Langflow OSS are affected by CVE-2026-7664?

IBM Langflow OSS versions 1.0.0 through 1.8.4 are affected by CVE-2026-7664.

5

What type of vulnerability is CVE-2026-7664?

CVE-2026-7664 is an unauthenticated flow execution vulnerability due to improper authorization enforcement.

Company

Resources

Contact

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