CVE-2026-2393

Description

A Server-Side Request Forgery (SSRF) vulnerability exists in MLflow versions prior to 3.9.0. The `_create_webhook()` function in `mlflow/server/handlers.py` accepts a user-controlled `url` parameter without validation, and the `_send_webhook_request()` function in `mlflow/webhooks/delivery.py` sends HTTP POST requests to this attacker-controlled URL. This allows an authenticated attacker to force the MLflow backend to send HTTP requests to internal services, cloud metadata endpoints, or arbitrary external servers. The lack of input sanitization, URL scheme filtering, or allowlist validation on the webhook URL enables exploitation, potentially leading to cloud credential theft, internal network access, and data exfiltration.

How to fix CVE-2026-2393

To remediate CVE-2026-2393, upgrade the affected package to a fixed version below.

• —upgrade to 3.9.0 or later
• —upgrade to 3.9.0 or later

Is CVE-2026-2393 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 3.9.0
• from 0, < 3.9.0

CVSS scores

References (4)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-2393
• PATCHgithub.com/mlflow/mlflow
• WEBgithub.com/mlflow/mlflow/commit/64aa0ab7207f9c649b59ba1a5f40d82196817389
• WEBhuntr.com/bounties/04ef100d-06b5-4a70-95b1-b7be23aa8150