MLflow Webhook Server-Side Request Forgery Vulnerability

October 29th, 2026
ZDI-26-846 ZDI-CAN-31844

CVE ID

CVE-2026-64849

CVSS Score

6.8 AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

Affected Vendors

MLflow

Affected Products

MLflow

Vulnerability Details

This vulnerability allows remote attackers to initiate arbitrary server-side requests on affected installations of MLflow. Authentication is required to exploit this vulnerability.

The specific flaw exists within the handling of webhook test requests. The issue results from the lack of proper validation of a URI prior to accessing resources. An attacker can leverage this vulnerability to disclose information in the context of the service account.

Additional Details

MLflow has issued an update to correct this vulnerability. More details can be found at:
https://github.com/mlflow/mlflow/pull/24258

Disclosure Timeline

  • 2026-06-16 - Vulnerability reported to vendor
  • 2026-10-29 - Coordinated public release of advisory
  • 2026-10-29 - Advisory Updated

Credit

Minh Giang (@itscysamu) of TrendAI Zero Day Initiative

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