# CVE-2026-33760: Langflow IDOR in monitor API endpoints

Source: https://junglewise.ai/threats/cve-2026-33760-langflow-idor-in-monitor-api-endpoints  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-23. Updated: 2026-06-23  
License: CC BY 4.0 with a link back

CVE-2026-33760 · Severity: high · CVSS 8.8 · Published 2026-06-23

Langflow, a platform for building AI agents and workflows, contains a security flaw where users can access or delete data belonging to other users. By knowing a specific resource ID, any logged-in user can read private chat histories, modify messages, or delete entire workflow sessions and build logs. This could lead to the exposure of sensitive AI prompts and responses, as well as the corruption of critical business workflows.

Technologies: [langflow (PyPI)](https://junglewise.ai/threats/technologies/pypi-langflow). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2026-33760 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-33760 being exploited in the wild.

**How severe is CVE-2026-33760?** High severity, with a CVSS score of 8.8, published 23 June 2026.

**Which products and versions are affected?** langflow (PyPI) ECOSYSTEM:introduced=0,fixed=1.9.0.

**Is there a fix for CVE-2026-33760?** Yes. langflow (PyPI): upgrade to 1.9.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-33760 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-33760?** Check whether you run langflow (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- langflow (PyPI): upgrade to 1.9.0 or later

  ```sh
  pip install "langflow>=1.9.0"
  ```


## Technical details

Langflow's `/api/v1/monitor` router fails to perform ownership validation across seven different endpoints (GET, PUT, PATCH, and DELETE). While the application correctly implements ownership checks in one specific endpoint, the vulnerable endpoints in `monitor.py` accept `flow_id`, `message_id`, or `session_id` parameters without verifying that the `current_user` owns the associated resource. An authenticated attacker can exploit this to perform unauthorized CRUD operations on messages, sessions, build artifacts, and LLM transaction logs. The vulnerability is classified as IDOR/BOLA (Broken Object Level Authorization) and is resolved in version 1.9.0.

## Affected products

- langflow-ai Langflow < 1.9.0

## Identifiers

- CVE-2026-33760
- GHSA-9c59-2mvc-vfr8
- PYSEC-2026-242

## Timeline

- 2026-06-11: advisory: GitHub Security Advisory published
- 2026-06-23: disclosed: NVD publication date

## References

- [https://github.com/langflow-ai/langflow/security/advisories/GHSA-9c59-2mvc-vfr8](https://github.com/langflow-ai/langflow/security/advisories/GHSA-9c59-2mvc-vfr8)

## Related threats

- [Langflow SSRF in URL-taking components](https://junglewise.ai/threats/langflow-ssrf-in-url-taking-components-protection-disabled-by-default-db7cac37)
- [Langflow IP spoofing in MCP configuration installation](https://junglewise.ai/threats/cve-2026-105741-langflow-is-a-tool-for-building-and-deploying-ai-powered-agents)
- [Langflow path traversal and cross-user disclosure in MCP resources](https://junglewise.ai/threats/cve-2026-105699-langflow-is-a-tool-for-building-and-deploying-ai-powered-agents)
- [Langflow authorization bypass in flow API endpoints](https://junglewise.ai/threats/cve-2026-105698-langflow-is-a-tool-for-building-and-deploying-ai-powered-agents)
- [Langflow MCP stdio command injection](https://junglewise.ai/threats/cve-2026-105697-langflow-is-a-tool-for-building-and-deploying-ai-powered-agents)