| Component | Langflow |
| Severity | high (CVSS 8.8) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| Published (NVD) | 2026-06-23 |
| Last modified | 2026-06-26 |
| Affected versions | langflow < 1.9.0 |
| Fixed in | 1.9.0 |
| Weakness | CWE-639 |
| CISA KEV | not listed |
NVD description
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.0, Langflow's /api/v1/monitor router exposes 7 endpoints that perform read, write, and delete operations on user-owned resources — messages, sessions, build artifacts, and LLM transaction logs — without verifying that the authenticated requester owns the targeted resource. Any authenticated user can read, modify, rename, or permanently delete another user's data by supplying the target's resource ID or flow_id. This is a classic IDOR/BOLA vulnerability. Notably, the same source file (monitor.py) contains one correctly-implemented endpoint that uses an ownership check, demonstrating the correct pattern was known but inconsistently applied. This vulnerability is fixed in 1.9.0.
What to do
- Upgrade Langflow to
1.9.0or 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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