What’s Vulnerable › Vulnerabilities

CVE-2026-2393: Server-Side Request Forgery (SSRF) in mlflow/mlflow

• Severity: high (CVSS 7.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-11 · updated 2026-06-17
• Weakness: CWE-918

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.

Affected products

• mlflow/mlflow: before 3.9.0 — fixed in 3.9.0

How to fix

Upgrade to a fixed version: mlflow/mlflow 3.9.0. Check the vendor advisory for mitigations.

References

• https://github.com/mlflow/mlflow/commit/64aa0ab7207f9c649b59ba1a5f40d82196817389
• https://huntr.com/bounties/04ef100d-06b5-4a70-95b1-b7be23aa8150
• https://huntr.com/bounties/04ef100d-06b5-4a70-95b1-b7be23aa8150

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