CVE-2026-7663 – Unauthenticated Cross-User MCP Resource Access and Tool Execution via Streamable Transport Authorization Bypass

CVE ID :CVE-2026-7663

Published : June 30, 2026, 7:16 p.m. | 29 minutes ago

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.

Severity: 9.1 | CRITICAL

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