Medium severity · published Apr 7, 2026
CVE-2026-33865
Stored XSS via unsafe YAML parsing in MLflow
5.4
CVSS
0.2%
EPSS
No
On KEV
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
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ML
Mlflow · Mlflow
through 3.10.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33865
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33865
Exploit
https://afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectors
Third Party Advisory
https://cert.pl/en/posts/2026/04/CVE-2026-33865/
Issue Tracking
https://github.com/mlflow/mlflow/pull/21435
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No description published yet