CVE-2026-2611 — MLflow: Improper Origin Validation in mlflow — CVE...

CRITICAL

MLflow: Improper Origin Validation in MLflow Assistant /ajax-api Endpoints Enables Browser-Mediated Local Command Execution

Published May 19, 2026Updated October 5, 2026Source: osv

Summary

In MLflow version 3.9.0, the MLflow Assistant feature introduced improper origin validation in its /ajax-api endpoints. This vulnerability allows a remote attacker to exploit cross-origin requests from a malicious webpage to interact with the MLflow Assistant running on a victim's local machine. By bypassing the loopback-only restriction, the attacker can modify the Assistant's configuration to enable full access, which in turn allows the execution of arbitrary commands via the Claude Code sub-agent. This issue is resolved in version 3.10.0.

Advisory Timeline

First published May 19, 2026 (146 days ago).
Last revised October 5, 2026 — 139 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

pip

Update mlflow to 3.10.0 or later

pip install "mlflow>=3.10.0"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: pypi (1).

Package	Ecosystem	Affected	Fixed In
mlflow	pypi	3.10.0rc0, 3.9.0	3.10.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-346
Origin Validation ErrorMITRE
CWE-940
View on MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.6 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-2611?: MLflow: Improper Origin Validation in MLflow Assistant /ajax-api Endpoints Enables Browser-Mediated Local Command Execution This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.6/10).
How do I check if my project is affected by CVE-2026-2611?: CVE-2026-2611 affects mlflow. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-2611 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

9.6

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-67c5-x5mf-rppq

BIT-mlflow-2026-2611

PYSEC-2026-418

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