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

Advisory record · `GHSA-67c5-x5mf-rppq`

- **Identifiers:** `GHSA-67c5-x5mf-rppq` · `BIT-mlflow-2026-2611` · `CVE-2026-2611` · `PYSEC-2026-418`
- **State:** Confirmed
- **Severity:** CVSS 9.6 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-346](https://cwe.mitre.org/data/definitions/346.html) · [CWE-940](https://cwe.mitre.org/data/definitions/940.html)
- **Tags:** [CWE-346](https://agentprime.io/advisories/tag/cwe-346.md) · [CWE-940](https://agentprime.io/advisories/tag/cwe-940.md)
- **Published:** 19 May 2026
- **Updated:** 5 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 19 May 2026, 12:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.6: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `mlflow` (PyPI): affected `>=3.9.0, <3.10.0`; fixed in `3.10.0`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> MLflow versions 3.9.0 up to but not including 3.10.0 are affected. The MLflow Assistant /ajax-api endpoints do not properly validate request origin, so a user visiting a malicious webpage can have their browser send cross-origin requests to a locally running Assistant. This lets an attacker change the Assistant's configuration to full access and then run arbitrary commands through its Claude Code sub-agent. Upgrade to MLflow 3.10.0 or later.

Written 1 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 9.6 Critical, CVSS 3.0: `CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`, from CNA (@huntr_ai)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0038, the 32nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:09 UTC: First seen by agentprime
- 31 Oct 2026, 14:09 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-67c5-x5mf-rppq)

## Sources

- [GitHub Advisory Database: GHSA-67c5-x5mf-rppq](https://github.com/advisories/GHSA-67c5-x5mf-rppq)
- [OSV: GHSA-67c5-x5mf-rppq](https://osv.dev/vulnerability/GHSA-67c5-x5mf-rppq)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-2611>
- <https://github.com/mlflow/mlflow/commit/8f9c8a53af90842944101eb8b7d60706822c81bc>
- <https://access.redhat.com/security/cve/CVE-2026-2611>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2479797>
- <https://github.com/advisories/GHSA-67c5-x5mf-rppq>
- <https://github.com/mlflow/mlflow>
- <https://github.com/pypa/advisory-database/tree/main/vulns/mlflow/PYSEC-2026-418.yaml>
- <https://huntr.com/bounties/8462addd-b464-4a84-b6a2-5529604e6e5a>
- <https://pypi.org/project/mlflow>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-67c5-x5mf-rppq>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-67c5-x5mf-rppq/>. Everything for agents: <https://agentprime.io/llms.txt>.