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Full vulnerability report · 2026
CVE-2026-0545High confidence

Missing Authentication for Critical Function in mlflow/mlflow

mlflow · mlflow/mlflow

9.8CriticalCVSS 3.1
Recommended action
Within 72 hours

Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.

Patch available
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-0545 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitymlflow/mlflow: mlflow/mlflow: Unauthenticated remote code execution via unprotected job endpoints
1 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
Summary
A flaw was found in mlflow/mlflow. When the `basic-auth` application is enabled, the FastAPI job endpoints are not protected by authentication or authorization. A remote attacker can exploit this by sending requests to these endpoints, bypassing security measures entirely. This can lead to unauthenticated remote code execution if allowed jobs perform privileged actions, or potentially result in job spam, denial of service (DoS), or data exposure.
Remediation
For Red Hat OpenShift AI 3.4.4 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-18809

No EUVD known-exploited evidence

In mlflow/mlflow, the FastAPI job endpoints under `/ajax-api/3.0/jobs/*` are not protected by authentication or authorization when the `basic-auth` app is enabled. This vulnerability affects the latest version of the repository. If job execution is enabled (`MLFLOW_SERVER_ENABLE_JOB_EXECUTION=true`) and any job function is allowlisted, any network client can submit, read, search, and cancel jobs without credentials, bypassing basic-auth entirely. This can lead to unauthenticated remote code execution if allowed jobs perform privileged actions such as shell execution or filesystem changes. Even if jobs are deemed safe, this still constitutes an authentication bypass, potentially resulting in job spam, denial of service (DoS), or data exposure in job results.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
8.1 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 72 hours

Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.

Patch available
01

What, why and how

In mlflow/mlflow, the FastAPI job endpoints under `/ajax-api/3.0/jobs/*` are not protected by authentication or authorization when the `basic-auth` app is enabled. This vulnerability affects the latest version of the repository. If job execution is enabled (`MLFLOW_SERVER_ENABLE_JOB_EXECUTION=true`) and any job function is allowlisted, any network client can submit, read, search, and cancel jobs without credentials, bypassing basic-auth entirely. This can lead to unauthenticated remote code execution if allowed jobs perform privileged actions such as shell execution or filesystem changes. Even if jobs are deemed safe, this still constitutes an authentication bypass, potentially resulting in job spam, denial of service (DoS), or data exposure in job results.

What

In mlflow/mlflow, the FastAPI job endpoints under `/ajax-api/3.0/jobs/*` are not protected by authentication or authorization when the `basic-auth` app is enabled. This vulnerability affects the latest version of the repository. If job execution is enabled (`MLFLOW_SERVER_ENABLE_JOB_EXECUTION=true`) and any job function is allowlisted, any network client can submit, read, search, and cancel jobs without credentials, bypassing basic-auth entirely. This can lead to unauthenticated remote code execution if allowed jobs perform privileged actions such as shell execution or filesystem changes. Even if jobs are deemed safe, this still constitutes an authentication bypass, potentially resulting in job spam, denial of service (DoS), or data exposure in job results.

Why

A security-sensitive function is reachable without the authentication check that should protect it.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

What

In mlflow/mlflow, the FastAPI job endpoints under `/ajax-api/3.0/jobs/*` are not protected by authentication or authorization when the `basic-auth` app is enabled. This vulnerability affects the latest version of the repository. If job execution is enabled (`MLFLOW_SERVER_ENABLE_JOB_EXECUTION=true`) and any job function is allowlisted, any network client can submit, read, search, and cancel jobs without credentials, bypassing basic-auth entirely. This can lead to unauthenticated remote code execution if allowed jobs perform privileged actions such as shell execution or filesystem changes. Even if jobs are deemed safe, this still constitutes an authentication bypass, potentially resulting in job spam, denial of service (DoS), or data exposure in job results.

Why

A security-sensitive function is reachable without the authentication check that should protect it.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Missing Authentication for Critical Function → execute code or commands in the affected security context
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-306 ↗

CWE-306: Missing Authentication for Critical Function. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
NetworkUnauthenticatedRemote code executionDenial of serviceCWE-306Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-18809Official EUVD mapping

In mlflow/mlflow, the FastAPI job endpoints under `/ajax-api/3.0/jobs/*` are not protected by authentication or authorization when the `basic-auth` app is enabled. This vulnerability affects the latest version of the repository. If job execution is enabled (`MLFLOW_SERVER_ENABLE_JOB_EXECUTION=true`) and any job function is allowlisted, any network client can submit, read, search, and cancel jobs without credentials, bypassing basic-auth entirely. This can lead to unauthenticated remote code execution if allowed jobs perform privileged actions such as shell execution or filesystem changes. Even if jobs are deemed safe, this still constitutes an authentication bypass, potentially resulting in job spam, denial of service (DoS), or data exposure in job results.

Official EUVD record
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
Fixed
registry.redhat.io/rhoai/odh-pipeline-runtime-datascience-cpu-py312-rhel9@sha256:368a3a34d5f57726bde442bf02963ecb1724d648e1dfdebe30fbd026c80fa38c_ppc64le as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-pipeline-runtime-datascience-cpu-py312-rhel9@sha256:69ee4240b85018bdcf1da71892e2f9af24ee32e3f28d92201cfd6f8e30027a64_amd64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-pipeline-runtime-datascience-cpu-py312-rhel9@sha256:6b16b2aac3263e9813c2e69d76e2f9565490b5794ed9d76a590f6df3c1c801ef_arm64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-pipeline-runtime-datascience-cpu-py312-rhel9@sha256:6be3ab2d871034dfe789baac493097b860489134cc20e35e172e9ba7a056292a_s390x as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9@sha256:f63b31c251afd3260357876fdbc5fc9521df4803875110f94916b10cfbb94c86_amd64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9@sha256:70e0fb79848b7aa369a969ff2a2b784cee865799c09ef105d2c340ebc8e10478_amd64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9@sha256:5e0260262d6a8854b19403448c45107ba42101afc408d3641453aa9efe4d8212_amd64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-pipeline-runtime-tensorflow-cuda-py312-rhel9@sha256:15f5d799d1ba9318a757445ce94b84b7855b7c6ce37c46e199cac9d8eacf41a2_arm64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-pipeline-runtime-tensorflow-cuda-py312-rhel9@sha256:a9ada15c58e4d22767510fc654207223b5b586c89a1b897d5cc92647158a56ad_amd64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-pipeline-runtime-tensorflow-rocm-py312-rhel9@sha256:9628c5e318cac3bfb38178693fd770288312d51b0c5b07ba5693484d1ab27c12_amd64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9@sha256:206b9bc4eb2f30537b9d1f99cc0ebc4926fcb1e936ef6b6a2ffcebd3abdc0bb4_arm64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9@sha256:7ca4c6c3d13ac3bf0436a4a9e052247060f44e2f2d1edaa83350850fe3aa41e6_amd64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9@sha256:8b383544df737cf00bac9ce111db652e418e7c5afac87178545e81d63dda5396_ppc64le as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9@sha256:c7d097730722e47ac86c864e38a70c044cc5f1c93a9d8db17f502113cfdb0f2d_s390x as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-jupyter-datascience-cpu-py312-rhel9@sha256:85b77613b0c457e6ddf6c189439f8ff4f14c46ce3e5270f2ddc3b8c59c0d4c20_arm64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-jupyter-datascience-cpu-py312-rhel9@sha256:a2c7a670ce95fee5f840960268830f936836663179baf3711219fb9f47339f0a_ppc64le as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-jupyter-datascience-cpu-py312-rhel9@sha256:d42aafacf60f441165985ee9b3218cefe0632024b04ae4067cba72b441168a10_amd64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-jupyter-datascience-cpu-py312-rhel9@sha256:ff5dea366ee3bc3fd2d1f1f25ab498292bb6c0d02686bbcc13adf4a6e45bfd97_s390x as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-jupyter-pytorch-cuda-py312-rhel9@sha256:190a1cbd8d62718270e459f7a7480d86234491b98b62e42d8ff4729e81b01eed_amd64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-jupyter-pytorch-rocm-py312-rhel9@sha256:e15a412f74c1a63d3228cf473766769cc25245c29f84f189b82998fea7ed0524_amd64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-jupyter-tensorflow-cuda-py312-rhel9@sha256:3f3cd6198802052e0fc671b9dcbe125c0bd20d4ba1c51d31d732e5356625eca6_amd64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-jupyter-tensorflow-cuda-py312-rhel9@sha256:76860835384964a716661f95118671da6e36bb4d527b44f55d3759d1459e2a6c_arm64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-jupyter-tensorflow-rocm-py312-rhel9@sha256:13a0e218aa285b526eed89feaa529e6f24a9b1b2bea0615629e570c1eddc997f_amd64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-jupyter-trustyai-cpu-py312-rhel9@sha256:7c87a18cf11f29594218f740fbd309831cc6948c60390c77666128e26567453c_arm64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-jupyter-trustyai-cpu-py312-rhel9@sha256:945800fe8ee72610795c7ff98c16405b8c5d51e3c6dea7b65e85bbf7a3fbedb6_ppc64le as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-jupyter-trustyai-cpu-py312-rhel9@sha256:ba3298973fcee334a785208bad7928c87212b35a2bd49bf0e83875e240481e95_s390x as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-workbench-jupyter-trustyai-cpu-py312-rhel9@sha256:c78ea41efa92d8e87111cb254c1943ae285b326c68a0749c5b77c12ceb8209b5_amd64 as a component of Red Hat OpenShift AI 3.4
Action
For Red Hat OpenShift AI 3.4.4 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 3 Apr 2026 · Last source change 28 Aug 2026, 12:04 UTC · CWE-306 · Missing Authentication for Critical Function

CVE recordCVE.org · 5.2
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-18809
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →
  1. Vendor guidanceAuthoritative vendor guidance changed from vendor advisory to no authoritative guidance recorded.
    Before
    vendor advisory
    After
    no authoritative guidance recorded
    CNA ↗
  2. Vendor guidanceAuthoritative vendor guidance changed from no authoritative guidance recorded to vendor advisory.
    Before
    no authoritative guidance recorded
    After
    vendor advisory
    0b0ca135-0b70-47e7-9f44-1890c2a1c46c ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-18809↗Vendor CSAF · Red Hat Product Security↗CISA Vulnrichment SSVC evidence↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-0545 · cve.blacktree.nl