CVE-2026-3198 — MEDIUM (6.5)

Vulnerability Description

MLflow 3.9.0 with basic-auth (`--app-name basic-auth`) fails to enforce authorization checks for multiple Gateway API 'list' endpoints. Specifically, the `BEFORE_REQUEST_HANDLERS` dictionary in `mlflow/server/auth/__init__.py` does not include entries for `ListGatewaySecretInfos`, `ListGatewayEndpoints`, and `ListGatewayModelDefinitions`. This allows any authenticated user, regardless of their assigned permissions, to enumerate all gateway secrets, endpoints, and model definitions. This vulnerability exposes sensitive information, such as API keys, endpoint configurations, and proprietary model definitions, to unauthorized users.

CVSS Score

6.5

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

NONE

Affected Products

Vendor	Product	Versions
Lfprojects	Mlflow	3.9.0

Related Weaknesses (CWE)

CWE-284

References

https://huntr.com/bounties/e57db731-97d3-40c3-a429-831ee959807fExploitThird Party Advisory
https://huntr.com/bounties/e57db731-97d3-40c3-a429-831ee959807fExploitThird Party Advisory

FAQ

What is CVE-2026-3198?

CVE-2026-3198 is a vulnerability with a CVSS score of 6.5 (MEDIUM). MLflow 3.9.0 with basic-auth (`--app-name basic-auth`) fails to enforce authorization checks for multiple Gateway API 'list' endpoints. Specifically, the `BEFORE_REQUEST_HANDLERS` dictionary in `mlflo...

How severe is CVE-2026-3198?

CVE-2026-3198 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-3198?

Check the references section above for vendor advisories and patch information. Affected products include: Lfprojects Mlflow.