| Component | Langflow |
| Severity | critical (CVSS 9.8) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Published (NVD) | 2026-06-22 |
| Last modified | 2026-06-26 |
| Affected versions | langflow >= 1.0.0, <= 1.8.4 |
| Fixed in | see the vendor advisory |
| Weakness | CWE-287 |
| CISA KEV | not listed |
NVD description
IBM Langflow OSS 1.0.0 through 1.8.4 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.
What to do
- NVD lists no fixed version yet: follow the vendor advisory below and keep Langflow off the public internet until a fix ships.
- 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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