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CVE-2026-33865

Stored XSS via unsafe YAML parsing in MLflow

Published: Apr 7, 2026Updated: Apr 20, 2026 Sources: CVE List NVDCWE-79
5.4MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 87.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

Mlflow
oss-project
Mlflow
AI / ML / notebook-mlops
lfprojects
oss-projectaka model context protocol servers, mlflow, valkey, mcp servers
mlflowOn-premLibrary
AI / ML / notebook-mlops

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/mlflow/mlflow/pull/21435
github.com
https://cert.pl/en/posts/2026/04/CVE-2026-33865/
cert.pl
https://afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectors
afine.com

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