CVE-2026-33865
Stored XSS via unsafe YAML parsing in MLflow
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
INFO
Published Date :
April 7, 2026, 1:16 p.m.
Last Modified :
April 20, 2026, 6:44 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 4bb8329e-dd38-46c1-aafb-9bf32bcb93c6 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update MLflow to a fixed version.
- Sanitize YAML parsing in MLflow artifacts.
- Validate all ML model artifact inputs.
- Restrict access to MLflow artifact upload functionality.
Public PoC/Exploit Available at Github
CVE-2026-33865 has a 4 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33865.
| URL | Resource |
|---|---|
| https://afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectors | Exploit Third Party Advisory |
| https://cert.pl/en/posts/2026/04/CVE-2026-33865/ | Third Party Advisory |
| https://github.com/mlflow/mlflow/pull/21435 | Issue Tracking Patch |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33865 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33865
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
None
None
CVEs, conference materials, research.
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33865 vulnerability anywhere in the article.
-
cert.pl
Vulnerabilities in Mlflow software
Vulnerabilities in Mlflow software CVE ID CVE-2026-33865 Publication date 07 April 2026 Vendor Mlflow Product Mlflow Vulnerable versions All through 3.10.1 Vulnerability type (CWE) Improper Neutraliza ... Read more
The following table lists the changes that have been made to the
CVE-2026-33865 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:lfprojects:mlflow:*:*:*:*:*:*:*:* versions up to (including) 3.10.1 Added Reference Type CERT.PL: https://afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectors Types: Exploit, Third Party Advisory Added Reference Type CERT.PL: https://cert.pl/en/posts/2026/04/CVE-2026-33865/ Types: Third Party Advisory Added Reference Type CERT.PL: https://github.com/mlflow/mlflow/pull/21435 Types: Issue Tracking, Patch -
CVE Modified by [email protected]
Apr. 09, 2026
Action Type Old Value New Value Added Reference https://afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectors -
New CVE Received by [email protected]
Apr. 07, 2026
Action Type Old Value New Value Added 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 Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-79 Added Reference https://cert.pl/en/posts/2026/04/CVE-2026-33865/ Added Reference https://github.com/mlflow/mlflow/pull/21435