Improper Authorization Vulnerability in IBM Langflow OSS
CVE-2026-7663

9.1CRITICAL

Key Information:

Vendor

IBM
Status
Langflow Oss
Vendor
CVE Published:
30 June 2026

What is CVE-2026-7663?

IBM Langflow OSS versions 1.0.0 through 1.9.6 are susceptible to a vulnerability that allows unauthenticated attackers to gain access to restricted MCP project resources and perform MCP operations. This issue arises from inadequate authorization checks in the Streamable MCP transport endpoint, creating potential security risks for organizations using this software.

Affected Version(s)

Langflow OSS 1.0.0 <= 1.9.6

References

https://www.ibm.com/support/pages/node/7277570
vendor-advisorypatch

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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