Authentication Bypass Vulnerability in FastAPI Job Endpoints of MLflow
CVE-2026-0545

9.1CRITICAL

Key Information:

Vendor

Mlflow

Status
Mlflow/mlflow
Vendor
CVE Published:
3 April 2026

What is CVE-2026-0545?

In MLflow, the FastAPI job endpoints under /ajax-api/3.0/jobs/* lack proper authentication and authorization when the basic-auth app is active. This oversight allows unrestricted access to job functionalities such as submission, retrieval, and cancellation. With job execution enabled, any malicious actor can exploit this vulnerability to perform unauthorized actions, including potential remote code execution. Even benign jobs may inadvertently expose sensitive information, leading to serious consequences like job spam or data leakage.

Affected Version(s)

mlflow/mlflow <= unspecified

References

https://huntr.com/bounties/b2e5b028-9541-4d29-8703-a76f1a...

CVSS V3.0

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.