CVE-2026-105698: Langflow Cross-User Flow Access and Vertex Execution

# CVE-2026-105698: Langflow Cross-User Flow Access and Vertex Execution

https://gcdradar.vercel.app/incidents/cve-2026-105698-langflow-cross-user-flow-access-and-vertex-e · AIR-2026-0234 · closed 2026-10-05

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-10-05
- AI role: Attack on AI
- Products: Langflow
- CVE ids: CVE-2026-105698
- CVSS: 5.4

## Summary

Langflow failed to properly verify flow ownership in deprecated build endpoints, allowing callers with a known flow UUID to access private graphs and execute vertices. The vulnerability was resolved in subsequent updates.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-10-07: CVE-2026-105698: Langflow : Cross-user flow access and vertex execution via deprecated /api/v1/build/{flow_id}/vertices endpoints (https://github.com/advisories/GHSA-gh98-4phw-6fmw)
- 2026-10-05: CVE-2026-105698: Langflow is a tool for building and deploying AI-powered agents and workflows. (https://nvd.nist.gov/vuln/detail/CVE-2026-105698)

## Sources

- 2026-10-05 NVD: CVE-2026-105698: Langflow is a tool for building and deploying AI-powered agents and workflows. https://nvd.nist.gov/vuln/detail/CVE-2026-105698
- 2026-10-07 GitHub Advisory Database: CVE-2026-105698: Langflow : Cross-user flow access and vertex execution via deprecated /api/v1/build/{flow_id}/vertices endpoints https://github.com/advisories/GHSA-gh98-4phw-6fmw

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.