Langflow: IDOR/BOLA in Monitor API — Missing Ownership Enforcement on 7 Endpoints (langflow-ai langflow)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.50 % · percentile 42 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
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.
Weaknesses (CWE)
- CWE-639 — Authorization Bypass Through User-Controlled Key
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | GitHub_M |
| CVSS 3.1 | HIGH 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · security-advisories@github.com (Secondary) |
Advisories
- GHSA-9c59-2mvc-vfr8 — Langflow: IDOR/BOLA in Monitor API — Missing Ownership Enforcement on 7 Endpoints
- PYSEC-2026-242 — 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 perfor
European references
- ENISA EUVD · EUVD-2026-38519
- GCVE · GCVE-0-2026-33760
Affected configurations (NVD CPE)
cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*< 1.9.0
Affected products
| Product | Versions |
|---|---|
| langflow-ai · langflow | affected < 1.9.0 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |