CVE-2026-9186

MediumCVSS 6.5/10Last modified Sep 8, 2026

Description

IBM Langflow OSS 1.0.0 through 1.11.2 allows remote authenticated attackers to bypass localhost-only MCP configuration installation by spoofing X-Forwarded-For: 127.0.0.1 header, enabling arbitrary writes to IDE config files (~/.cursor/mcp.json, etc.).

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-284

Affected software

Vendor	Product	Versions
IBM	Langflow OSS	>= 1.0.0, <= 1.11.2

References

https://www.ibm.com/support/pages/node/7285646Patch, Vendor Advisory

Timeline

Published: Sep 4, 2026
Last modified: Sep 8, 2026
NVD status: Analyzed

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