CVE-2026-2652

HIGHNVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2026-05-15. NVD baseline CVSS 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 8.6Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled (--app-name basic-auth) and served via uvicorn (ASGI). The FastAPI permission middleware only enforces authentication on /gateway/ routes, leaving other routes such as the Job API (/ajax-api/3.0/jobs/*) and the OpenTelemetry trace ingestion API (/v1/traces) unprotected. This allows unauthenticated remote attackers to submit jobs, read job results, cancel running jobs, and inject arbitrary trace data into experiments. The issue arises from an architectural mismatch between Flask and FastAPI authentication mechanisms, where the _find_fastapi_validator() function fails to handle non-/gateway/ paths, resulting in a complete authentication bypass. This vulnerability is fixed in version 3.10.0.

CVSS v3
8.6
EG Score
8.6(medium)
EPSS
71.6%
KEV
Not listed

Published

May 15, 2026

Last Modified

May 18, 2026

Advisory Details (2)

Auto-updated May 15, 2026
No patch confirmed yet.
generic

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https://huntr.com/bounties/5aeff5f0-49c7-4180-b5cb-c9a046f16756
generic

Add missing authentication for fastapi routes (#20920) · mlflow/mlflow@bb62e77 · GitHub

https://github.com/mlflow/mlflow/commit/bb62e773263c14e9ba4d1a82fe72d0de2442c6aa

Vendor Advisories for CVE-2026-2652(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
mlflow0.0.1 ... 3.9.0rc0 (175 versions)3.11.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 112 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
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  3. 2026-07-21 15:24 UTCEPSS rescore
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  12. 2026-07-18 01:29 UTCOSV refresh
  13. 2026-07-16 17:03 UTCEPSS rescore
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  1. 2026-07-07 13:46 UTCEPSS rescore
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  24. 2026-06-21 14:56 UTCEPSS rescore
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  26. 2026-06-21 01:59 UTCEPSS rescore
  27. 2026-06-19 19:25 UTCEPSS rescore
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  44. 2026-06-07 15:25 UTCEPSS rescore
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  63. 2026-05-29 13:44 UTCEPSS rescore
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  65. 2026-05-28 13:44 UTCEPSS rescore
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  73. 2026-05-26 07:18 UTCEPSS rescore
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Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-2652.yaml
    First seen Jan 1, 2026

    MLflow < 3.10.0 - Authentication Bypass on FastAPI Routes

    Open source ↗

Frequently asked(5)

What is CVE-2026-2652?
CVE-2026-2652 is a high vulnerability published on May 15, 2026. A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled (--app-name basic-auth) and served via uvicorn (ASGI). The FastAPI permission middleware only enforces authentication on…
When was CVE-2026-2652 disclosed?
CVE-2026-2652 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-2652 actively exploited?
CVE-2026-2652 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 71.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-2652?
CVE-2026-2652 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-2652?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-2652, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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