CVE-2026-33866Public exploitNetwork attack vector

Artifact disclosure via omitted route validators

Published Apr 7, 2026 · Updated Apr 7, 2026

Missing authorization in MLflow 3.10.1 and earlier allows remote authenticated users to read restricted logged-model artifacts. The request hook treats a missing match in LOGGED_MODEL_BEFORE_REQUEST_VALIDATORS as allowed, leaving the artifact file and directory routes unchecked. Basic-auth mode must be enabled, and any account lacking read permission on the parent experiment can retrieve model files and metadata.

CVSS severity5.3
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in MLflow 3.10.1 and earlier allows remote authenticated users to read restricted logged-model artifacts. The request hook treats a missing match in LOGGED_MODEL_BEFORE_REQUEST_VALIDATORS as allowed, leaving the artifact file and directory routes unchecked. Basic-auth mode must be enabled, and any account lacking read permission on the parent experiment can retrieve model files and metadata.

The record

CVE
CVE-2026-33866
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
MLflow Project
Product
MLflow
Classifications
CWE-862, CAPEC-115, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 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=0 <=3.10.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MLflow Project · MLflowversion=0 <=3.10.1

Published CVSS scores

4.3NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
5.3CERT.PLCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
CAPEC-115Authentication Bypass
T1213Data from Information Repositories

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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