CVE-2026-33866

Authorization Bypass in MLflow AJAX Endpoint

5.3 MediumFix available

MLflow is vulnerable to an authorization bypass affecting the AJAX endpoint used to download saved model artifacts. Due to missing access‑control validation, a user without permissions to a given experiment can directly query this endpoint and retrieve model artifacts they are not authorized to access.

This issue affects MLflow version through 3.10.1

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: None
Availability: None

Exploit likelihood

0.38%Up 0.3 points since Apr 8, 2026

What each source reports

CVE List Score used 5.3

Authorization Bypass in MLflow AJAX Endpoint

This issue affects MLflow version through 3.10.1

Record: CVE-2026-33866
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness: CWE-862
Updated: 2026-11-02

EUVDEUVD-2026-19609 5.3

This issue affects MLflow version through 3.10.1

Record: EUVD-2026-19609
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-46r5-x6jq-v8g6 5.3

MLflow is vulnerable to an authorization bypass affecting the AJAX endpoint

This issue affects MLflow version through 3.10.1

Record: GHSA-46r5-x6jq-v8g6
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-862
Updated: 2026-11-02

NVD 5.3

This issue affects MLflow version through 3.10.1

Record: CVE-2026-33866
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/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
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-862
Updated: 2026-11-02

OSV 5.3

Authorization Bypass in MLflow AJAX Endpoint

This issue affects MLflow version through 3.10.1

Record: CVE-2026-33866
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness: CWE-862
Updated: 2026-11-02

OSVGHSA-46r5-x6jq-v8g6 5.3

MLflow is vulnerable to an authorization bypass affecting the AJAX endpoint

This issue affects MLflow version through 3.10.1

Record: GHSA-46r5-x6jq-v8g6
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-862
Updated: 2026-11-02

OSVPYSEC-2026-94 4.3

This issue affects MLflow version through 3.10.1

Record: PYSEC-2026-94
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

OSVBIT-mlflow-2026-33866 No score

Authorization Bypass in MLflow AJAX Endpoint

This issue affects MLflow version through 3.10.1

Record: BIT-mlflow-2026-33866
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`mlflow` PyPI	through 3.10.1	3.11.0rc0
`mlflow` Bitnami	before 3.11.1	3.11.1
`mlflow` PyPI	before 3.11.0rc0, plus listed versions 0.0.10.1.00.2.00.2.10.3.0 Show 45 moreShow less 0.4.00.4.10.4.20.5.00.5.10.5.20.6.00.7.00.8.00.8.10.8.20.9.00.9.0.10.9.11.0.01.1.01.1.1.dev01.10.01.11.01.12.01.12.11.131.13.11.14.01.14.11.15.01.16.01.17.01.18.01.19.01.2.01.20.01.20.11.20.21.21.01.22.01.23.01.23.11.24.01.25.01.25.11.26.01.26.11.27.01.28.0	3.11.0rc0

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-33866 is a medium vulnerability (CVSS 5.3) in Lfprojects Mlflow, published April 7, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.38%, the 31st percentile. Fixed in mlflow 3.11.0rc0.

References

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Left out here: 123 versions. The JSON record has them.