vulnerability / NVI-00016272 / Revision 1
Langflow: IDOR/BOLA in Monitor API — Missing Ownership Enforcement on 7 Endpoints
GitHub lists this reviewed advisory for langflow. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
8.8 high
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
langflow
source listed< 1.9.0
### Summary 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. ### Details **Source file: `src/backend/base/langflow/api/v1/monitor.py`** The correct pattern (used only in `GET /monitor/messages`, lines 77–80): ```python stmt = select(MessageTable) stmt = stmt.join(Flow, MessageTable.flow_id == Flow.id) stmt = stmt.where(Flow.user_id == current_user.id) # ownership enforced ``` All 7 vulnerable endpoints are missing this guard: **1. `GET /api/v1/monitor/builds` (lines 27–33)** — reads build data for any `flow_id`: ```python @router.get("/builds", dependencies=[Depends(get_current_active
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
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- GHSA-9c59-2mvc-vfr8 ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.