CVE-2026-2652Disclosure(lfprojects / mlflow)

LOWCVSS 8.6 · HIGH

Exploitation ongoing with high activity in latest observed window (1 mentions)

Immediate actions

Prioritize remediation for lfprojects mlflow systems immediately
Assume compromise if assets are exposed
Track advisory updates for patch or workaround availability

Recommended action window: Immediate (within 24h)

NVD description

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.

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3.5/ 10 priority

Sources & remediation

Patch / fix

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

Exploit / PoC references

Weakness type (CWE)

CWE-305

Priority

LOW

Exploitation

ACTIVE

PoC

YES

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

mlflow

Threat summary

Active exploitation appears in 1 classified signals
2 mentions across 2 observed days
Momentum state: stable

What's happening

Active exploitation reported across 1 signal
Technical details provided in 2 signals
Disclosure: 1 classified signal
Peaked 1d ago at 1 mentions (2026-05-19); latest day: 1
2 total mentions across 2 days

Affected systems

Vendors

lfprojects

Products

mlflow

Deep dive

Activity timeline2 mentions / 2d

Signal classification2 categories

Disclosure

150.0%

Active Exploitation

150.0%

Referenced assets4 URLs

By indicator

Classification over time

Date	Total	Labels

2026-05-19	1	Disclosure1
2026-08-10	1	Active Exploitation1

Full discourse2 posts

FOFA@fofabot143d
Disclosure
⚠️⚠️ CVE-2026-2652 (CVSS 8.6): Unauthenticated access to some FastAPI routes when basic-auth is enabled under uvicorn 🔗FOFA Link: https://en.fofa.info/result?qbase64=YXBwPSJNTGZsb3ci 🎯9.7K+ Results are found on http://en.fofa.info in the past year. FOFA Query: app="MLflow" 🔖Refer: https://huntr.com/bounties/5aeff5f0-49c7-4180-b5cb-c9a046f16756 #OSINT #FOFA #CyberSecurity #Vulnerability
Post summary
The post announces CVE‑2026‑2652, describing an unauthenticated access flaw in FastAPI routes under uvicorn, and shares FOFA search results and a bounty link without providing PoC or exploit details.
010034172.8K
14.4K followersView on X
CrowdSec@Crowd_Security60d
Active Exploitation
🚨 In this week’s newsletter, we cover CVE-2026-2652, an authentication bypass vulnerability affecting MLflow that is seeing active exploitation. We break down how attackers can access protected API endpoints without credentials, potentially exposing jobs and connected infrastructure, and what defenders should do next. Read the full analysis and protect your systems 👉 https://www.crowdsec.net/vulntracking-report/cve-2026-2652-mlflow-authentication-bypass
Post summary
The post announces that CVE-2026-2652 is an authentication bypass in MLflow, currently being exploited in the wild, without providing a PoC, exploit code, or patch details.
00030498
19.4K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	lfprojects	mlflow	-	-	-

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