CVE-2026-2652 Details
A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled (`--app-name basic-auth`) and served via uvicorn (ASGI). The FastAPI permission middleware only enforces authentication on `/gateway/` routes, leaving other routes such as the Job API (`/ajax-api/3.0/jobs/*`) and the OpenTelemetry trace ingestion API (`/v1/traces`) unprotected. This allows unauthenticated remote attackers to submit jobs, read job results, cancel running jobs, and inject arbitrary trace data into experiments. The issue arises from an architectural mismatch between Flask and FastAPI authentication mechanisms, where the `_find_fastapi_validator()` function fails to handle non-`/gateway/` paths, resulting in a complete authentication bypass. This vulnerability is fixed in version 3.10.0.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2026-2652
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
20.78 Probability of exploitation activity being observed over the next 30 days (97th percentile)
CVSS score for CVE-2026-2652
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
8.6 High
Products affected by CVE-2026-2652
Mlflow 3.4.0
Mlflow 3.6.0
Mlflow 3.7.0
Mlflow 3.9.0
Mlflow 3.3.1
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Low
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CVE-2026-2652 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 22 39.29%
DE 10 17.86%
IN 3 5.36%
NL 3 5.36%
RU 3 5.36%
FI 2 3.57%
GB 2 3.57%
KR 2 3.57%
FR 1 1.79%
GR 1 1.79%

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CVE-2026-2652 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 48 92.31%
Telecommunications 2 3.85%
Education 2 3.85%

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