CVE-2026-13484Public exploitNetwork attack vector

Authenticated schema access via absent route validators

Published Jun 28, 2026 · Updated Jun 28, 2026

Missing authorization in MLflow label-schema APIs allows remote authenticated users to read or alter experiment label schemas. The basic-auth request hook omits label-schema request classes from BEFORE_REQUEST_HANDLERS, so _find_validator returns no experiment permission check. Exposure requires a Linux source checkout of commit 4666cffc7912ea606d592fc38d6a75e2935f65e7 served with basic-auth; the unmerged code did not affect an MLflow release.

CVSS severity5.0
Medium
EPSS probability0.50%
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 label-schema APIs allows remote authenticated users to read or alter experiment label schemas. The basic-auth request hook omits label-schema request classes from BEFORE_REQUEST_HANDLERS, so _find_validator returns no experiment permission check. Exposure requires a Linux source checkout of commit 4666cffc7912ea606d592fc38d6a75e2935f65e7 served with basic-auth; the unmerged code did not affect an MLflow release.

The record

CVE
CVE-2026-13484
Published
Jun 28, 2026
Updated
Jun 28, 2026
Vendor
MLflow Project
Product
MLflow
Classifications
CWE-862, CWE-863, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 28, 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=4666cffc7912ea606d592fc38d6a75e2935f65e7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MLflow Project · MLflowversion=4666cffc7912ea606d592fc38d6a75e2935f65e7

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1.3VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
5.0VulDBCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
4.6VulDBAV:N/AC:H/Au:S/C:P/I:P/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
CWE-863Incorrect Authorization
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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