Stored XSS via unsafe YAML parsing in MLflow_CVE-2026-33865

5.1 / 10

MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N

Description

MLflow is vulnerable to Stored Cross-Site Scripting (XSS) caused by unsafe parsing of YAML-based MLmodel artifacts in its web interface. An authenticated attacker can upload a malicious MLmodel file containing a payload that executes when another user views the artifact in the UI. This allows actions such as session hijacking or performing operations on behalf of the victim.

This issue affects MLflow version through 3.10.1

Basic Information

ID CVE-2026-33865

Source CERT-PL

Published Apr 7, 2026 at 12:57

Modified Apr 9, 2026 at 13:31

Affected Product

Vendor Mlflow

Product Mlflow

Affected Versions Mlflow Mlflow 0

CWE Classification

CWE-79

References

{
    "lastseen": "",
    "description": "MLflow is vulnerable to Stored Cross-Site Scripting (XSS) caused by unsafe parsing of YAML-based MLmodel artifacts in its web interface. An authenticated attacker can upload a malicious MLmodel file containing a payload that executes when another user views the artifact in the UI. This allows actions such as session hijacking or performing operations on behalf of the victim. \n\nThis issue affects MLflow version through 3.10.1",
    "published": "2026-04-07T12:57:38.525Z",
    "modified": "2026-04-09T13:31:08.842Z",
    "type": "cve",
    "title": "Stored XSS via unsafe YAML parsing in MLflow",
    "source": "CERT-PL",
    "references": "https://github.com/mlflow/mlflow/pull/21435\nhttps://cert.pl/en/posts/2026/04/CVE-2026-33865/\nhttps://afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectors",
    "id": "CVE-2026-33865",
    "bulletinFamily": "",
    "cwe": [
        "CWE-79"
    ],
    "cvelist": null,
    "sourceData": "Mlflow Mlflow 0",
    "sourceHref": "",
    "cvss": {
        "score": 5.1,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Mlflow",
    "version": "0",
    "vendor": "Mlflow",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}