MLflow up to 3.9.x Assistant Feature /ajax-api origin validation

Summaryinfo

A vulnerability classified as critical was found in MLflow up to 3.9.x. Affected is an unknown function of the file /ajax-api of the component Assistant Feature. Such manipulation leads to origin validation. This vulnerability is documented as CVE-2026-2611. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in MLflow up to 3.9.x. It has been rated as critical. Affected by this issue is an unknown function of the file /ajax-api of the component Assistant Feature. The manipulation with an unknown input leads to a origin validation vulnerability. Using CWE to declare the problem leads to CWE-346. The product does not properly verify that the source of data or communication is valid. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at huntr.com. This vulnerability is handled as CVE-2026-2611 since 02/17/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 3.10.0 eliminates this vulnerability. Applying the patch 8f9c8a53af90842944101eb8b7d60706822c81bc is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• MLflow

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9

License

• open-source

Website

• Product: https://github.com/mlflow/mlflow/

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