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

What is CVE-2026-33053?

CVE-2026-33053 is a medium-severity missing authorization vulnerability in Langflow Langflow, published on 20 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-639

Which versions are affected by CVE-2026-33053?

3 open source packages ship an affected version, including langflow. It affects 1 product.

Products include Langflow Langflow.

How do I fix CVE-2026-33053?

Upgrade langflow to 1.9.0 or later.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-33053 being exploited?

There is no known exploitation of CVE-2026-33053 in the wild and no public exploit code.

Other vulnerabilities in Langflow Langflow

• CVE-2026-9198 IBM Langflow Code Injection Exploited Critical 9.8
• CVE-2026-0770 Langflow Inclusion of Functionality from Untrusted Control Sphere Exploited Critical 9.8
• CVE-2025-3248 Langflow Missing Authentication Exploited Critical 9.8
• CVE-2025-34291 Langflow Origin Validation Error Exploited Critical 9.4
• CVE-2026-33017 Langflow Code Injection Exploited Critical 9.3

All Langflow Langflow vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-rf6x-r45m-xv3w, PYSEC-2026-78.