IBMCVE-2026-9186
IBM Langflow OSS: spoofing
Medium6.5CVE-2026-9186 · Published Sep 4, 2026 · updated Sep 8, 2026
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.).
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Langflow OSS Product | >= 1.0.0, <= 1.11.2 | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-284
More IBM advisories
All IBM| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Sep 4 | IBM i: improper authorization | High8.1 | No fix yet |
| Sep 4 | IBM i: improper authentication | High8.1 | No fix yet |
| Sep 4 | IBM i: integer overflow | Medium6.3 | No fix yet |
| Sep 4 | IBM ContextForge MCP Gateway: privilege escalation | High8.8 | No fix yet |
| Sep 4 | IBM ContextForge MCP Gateway - Translate utility: information disclosure | High7.4 | No fix yet |
| Sep 4 | IBM Langflow OSS: path traversal | Medium5.4 | No fix yet |