CVE-2026-2611 Improper Origin Validation in mlflow/mlflow
Remote attackers can bypass origin validation to modify MLflow Assistant configuration and execute arbitrary commands via a malicious webpage.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-2611?
CVE-2026-2611 is a critical vulnerability in Lfprojects Mlflow, published on 19 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Which versions are affected by CVE-2026-2611?
4 open source packages ship an affected version, including mlflow. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mlflow Bitnami | From 3.9.0 | 3.10.0 |
mlflow PyPI | From 3.9.0 | 3.10.0 |
mlflow PyPI | From 3.9.0 | 3.10.0 |
mlflow PyPI | From 3.9.0 | 3.10.0 |
Products include Lfprojects Mlflow.
How do I fix CVE-2026-2611?
Upgrade mlflow to 3.10.0 or later.
Is CVE-2026-2611 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2611 exists.
Other vulnerabilities in Lfprojects Mlflow
- CVE-2026-64849 MLflow Server-Side Request Forgery
- CVE-2025-15379 Command Injection in mlflow/mlflow
- CVE-2024-0520 Remote Code Execution due to Full Controlled File Write in mlflow/mlflow
- CVE-2023-6977 Path Traversal: '\..\filename'
- CVE-2023-6709 Improper Neutralization of Special Elements Used in a Template Engine in mlflow/mlflow
Sources
Also known as BIT-mlflow-2026-2611, GHSA-67c5-x5mf-rppq, PYSEC-2026-418.