Server-Side Request Forgery (SSRF) in mlflow/mlflow

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Summary

CVECVE-2026-2393
StatePUBLISHED
Assigner@huntr_ai
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-11 18:16:31 UTC
Updated2026-05-13 15:53:49 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.0 7.1 HIGH from [email protected]

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

EPSS: 0.000310000 probability, percentile 0.089300000 (date 2026-05-14)

Problem Types: CWE-918 | CWE-918 CWE-918 Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.0[email protected]Secondary7.1HIGHCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
3.0CNADECLARED7.1HIGHCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mlflow Mlflow/mlflow affected unspecified 3.10.0 custom Not specified

References

ReferenceSourceLinkTags
github.com/mlflow/mlflow/commit/64aa0ab7207f9c649b59ba1a5f40d82196817389 [email protected] github.com
huntr.com/bounties/04ef100d-06b5-4a70-95b1-b7be23aa8150 134c704f-9b21-4f2e-91b3-4a467353bcc0 huntr.com
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