CVE-2026-0545Public exploitNetwork attack vector

Unauthenticated job control via unprotected FastAPI routes

Published Apr 3, 2026 · Updated Apr 3, 2026

Authentication bypass in MLflow 3.10.1 and earlier allows remote attackers to control server jobs through unauthenticated FastAPI routes. The basic-auth app protects the Flask tracking surface but mounts the /ajax-api/3.0/jobs/* FastAPI router without its authentication or authorization checks. Reachability requires job execution and an allowlisted function; exposed functions can disclose results, consume resources, or execute privileged actions.

CVSS severity9.8
Critical
EPSS probability4.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in MLflow 3.10.1 and earlier allows remote attackers to control server jobs through unauthenticated FastAPI routes. The basic-auth app protects the Flask tracking surface but mounts the /ajax-api/3.0/jobs/* FastAPI router without its authentication or authorization checks. Reachability requires job execution and an allowlisted function; exposed functions can disclose results, consume resources, or execute privileged actions.

The record

CVE
CVE-2026-0545
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
MLflow Project
Product
MLflow
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=latest

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MLflow Project · MLflowversion=unspecified <=latest

Published CVSS scores

9.8NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.1huntr.devCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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