| Component | MLflow |
| Severity | medium (CVSS 6.1) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| Published (NVD) | 2023-12-07 |
| Last modified | 2026-06-17 |
| Affected versions | mlflow <= 2.9.0 |
| Fixed in | see the vendor advisory |
| Weakness | CWE-79 |
| CISA KEV | not listed |
NVD description
A reflected Cross-Site Scripting (XSS) vulnerability exists in the mlflow/mlflow repository, specifically within the handling of the Content-Type header in POST requests. An attacker can inject malicious JavaScript code into the Content-Type header, which is then improperly reflected back to the user without adequate sanitization or escaping, leading to arbitrary JavaScript execution in the context of the victim's browser. The vulnerability is present in the mlflow/server/auth/__init__.py file, where the user-supplied Content-Type header is directly injected into a Python formatted string and returned to the user, facilitating the XSS attack.
What to do
- NVD lists no fixed version yet: follow the vendor advisory below and keep MLflow off the public internet until a fix ships.
- Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2023-6568
- https://github.com/mlflow/mlflow/commit/28ff3f94994941e038f2172c6484b65dc4db6ca1
- https://huntr.com/bounties/816bdaaa-8153-4732-951e-b0d92fddf709
Read more
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