Critical · published August 18, 2026
CVSS calls it critical at 9.3. It is confirmed in active exploitation. It sits in the 95.6th percentile for exploit probability.
MLflow is an open source AI engineering platform for agents, large language models, and machine learning models. Starting in 3.3.0 and prior to 3.15.0, the unauthenticated POST /api/2.0/mlflow/webhooks/{id}/test endpoint calls _validate_webhook_url() in mlflow/utils/validation.py only for the original URL while mlflow/webhooks/delivery.py follows redirects and re-resolves the hostname without pinning the validated address, allowing attackers to reach internal or cloud metadata services and receive response_status and response_body. This issue is fixed in version 3.15.0.
| Product | Versions | Fixed in |
|---|---|---|
| lfprojects/mlflow | ≥ 3.3.0, < 3.15.0 | 3.15.0 |