CVE-2025-11200Network attack vector

Authentication bypass via unvalidated account passwords

Published Oct 29, 2025 · Updated Oct 29, 2025

Weak password requirements in MLflow 2.21.0 allow remote attackers to bypass basic authentication through user registration. SqlAlchemyStore.create_user hashes passwords without validating their length, while the signup form accepts values as short as four characters. Exposure requires the basic-auth tracking server, and a newly registered account receives default READ access to tracked resources.

CVSS severity9.8
Critical
EPSS probability1.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak password requirements in MLflow 2.21.0 allow remote attackers to bypass basic authentication through user registration. SqlAlchemyStore.create_user hashes passwords without validating their length, while the signup form accepts values as short as four characters. Exposure requires the basic-auth tracking server, and a newly registered account receives default READ access to tracked resources.

The record

CVE
CVE-2025-11200
Published
Oct 29, 2025
Updated
Oct 29, 2025
Vendor
MLflow Project
Product
MLflow
Classifications
CWE-521, T1136
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 29, 2025Record 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=2.21.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MLflow Project · MLflowversion=2.21.0

Published CVSS scores

8.1Zero Day InitiativeCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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

Weakness, pattern, technique

CWE-521Weak Password Requirements
T1136Create Account

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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