| Component | Langflow |
| Severity | medium (CVSS 6.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| Published (NVD) | 2026-09-04 |
| Last modified | 2026-09-08 |
| Affected versions | langflow >= 1.0.0, < 1.11.3 |
| Fixed in | 1.11.3 |
| Weakness | CWE-284 |
| CISA KEV | not listed |
NVD 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.).
What to do
- Upgrade Langflow to
1.11.3or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
Read more
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