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Critical · 9.1 CVE-2026-7663 EUVD-2026-40384GHSA-5wjx-cxqm-p8r4

Unauthenticated Cross-User MCP Resource Access and Tool Execution via Streamable Transport Authorization Bypass

Published Jun 30, 2026 · Updated Jul 1, 2026 · Assigned by ibm

Vendor: IBM Product: Langflow OSS

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.

Affected products

VendorProductAffectedFixed
IBM Langflow OSS 1.0.0 – ≤ 1.9.6 —

References