EUVD-2026-39984
GHSA-wfp4-8wh2-c48v
Severity by source
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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
Network-accessible API requires low-privilege authentication and high complexity; no scope change and all impacts limited to label schema metadata only.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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
Lifecycle Timeline
2DescriptionCVE.org
A vulnerability has been found in MLflow up to 4666cffc7912ea606d592fc38d6a75e2935f65e7. The impacted element is an unknown function of the component Experiment-scoped Label Schema CRUD API. Such manipulation leads to missing authorization. It is possible to launch the attack remotely. A high complexity level is associated with this attack. The exploitability is regarded as difficult. The exploit has been disclosed to the public and may be used. A reply to the GitHub issue explains, that "[t]he labeling schema PR has not been merged yet. The auth handlers will be added before the release."
AnalysisAI
Missing authorization in MLflow's Experiment-scoped Label Schema CRUD API allows a remote, low-privileged attacker to perform unauthorized read, create, update, or delete operations on label schema resources. The vulnerability stems from a pre-release feature that was disclosed before its authentication handlers were implemented - a GitHub maintainer confirmed: 'The auth handlers will be added before the release.' A proof-of-concept is publicly available via the referenced GitHub issue. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) the target MLflow instance is running a development or pre-release build at or before commit 4666cffc7912ea606d592fc38d6a75e2935f65e7 that includes the unmerged label schema CRUD API feature; (2) the attacker holds at least low-level authenticated access to the MLflow instance (PR:L - unauthenticated exploitation is not possible per the CVSS vector); and (3) high attack complexity (AC:H) must be met, likely requiring knowledge of the undocumented API endpoints specific to the pre-release feature. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 1.3 (AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L) correctly characterizes this as a low-severity finding despite its remote attack vector. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated MLflow user with minimal privileges - such as a data scientist with read-only experiment access - sends crafted HTTP requests to the Experiment-scoped Label Schema CRUD API endpoints on a development or pre-release MLflow instance. Because no authorization checks exist, the attacker can create, modify, or delete label schema configurations for any experiment, potentially corrupting metadata used by other teams or pipelines. … |
| Remediation | No vendor-released patch has been confirmed at time of analysis - the GitHub maintainer response indicates auth handlers will be added prior to the feature's official release, meaning the fix is planned but not yet in a tagged version. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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