What’s Vulnerable › Vulnerabilities
CVE-2026-7663: Unauthenticated Cross-User MCP Resource Access and Tool Execution via Streamable Transport Authorization Bypass
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-30 · updated 2026-10-25
- Weakness: CWE-285
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
- IBM Langflow OSS: from 1.0.0 before 1.10.0 — fixed in 1.10.0
How to fix
Upgrade to a fixed version: IBM Langflow OSS 1.10.0. Check the vendor advisory for mitigations.
References
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