CVE-2026-33053: Langflow has Missing Ownership Verification in API Key Deletion (IDOR)

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-20 · updated 2026-06-17
Weakness: CWE-639

Description

Langflow is a tool for building and deploying AI-powered agents and workflows. In versions prior to 1.9.0, the delete_api_key_route() endpoint accepts an api_key_id path parameter and deletes it with only a generic authentication check (get_current_active_user dependency). However, the delete_api_key() CRUD function does NOT verify that the API key belongs to the current user before deletion.

Affected products

IBM Langflow OSS: before 1.9.0 — fixed in 1.9.0

How to fix

Upgrade to a fixed version: IBM Langflow OSS 1.9.0. Check the vendor advisory for mitigations.

References

https://github.com/langflow-ai/langflow/security/advisories/GHSA-rf6x-r45m-xv3w

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