CVE-2026-9186

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.).

Score

CVSS 3.1 6.5 Medium

Status

Analyzed - psirt@us.ibm.com

Published

2026-09-04

Last modified

2026-09-08

Weaknesses

CWE-284

Affected products

• Langflow Oss (Ibm)
• Langflow (Langflow)

References

• https://www.ibm.com/support/pages/node/7285646