IBM Langflow OSS 1.0.0 through 1.9.6 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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
IBM Langflow OSS affected
Version Status Constraints
1.0.0 affected ≤ 1.9.6

No data.

No data.

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Project Subscriptions

Vendors Products
Ibm Subscribe
Langflow Oss Subscribe
Advisories

No advisories yet.

Fixes

Solution

IBM strongly recommends addressing the vulnerability now by upgrading Langflow OSS to version 1.10.0 https://pypi.org/project/langflow/

Workaround

No workaround given by the vendor.

References
Link Providers
https://www.ibm.com/support/pages/node/7277570 cve-icon
History

Tue, 30 Jun 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 30 Jun 2026 19:30:00 +0000

Type Values Removed Values Added
Description IBM Langflow OSS 1.0.0 through 1.9.6 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.
Title Unauthenticated Cross-User MCP Resource Access and Tool Execution via Streamable Transport Authorization Bypass
First Time appeared Ibm
Ibm langflow Oss
Weaknesses CWE-285
CPEs cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:langflow_oss:1.9.6:*:*:*:*:*:*:*
Vendors & Products Ibm
Ibm langflow Oss
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: ibm

Published:

Updated: 2026-06-30T20:09:14.799Z

Reserved: 2026-05-01T19:43:15.220Z

Link: CVE-2026-7663

cve-icon Vulnrichment

Updated: 2026-06-30T20:09:10.763Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-30T20:30:04Z

Weaknesses