---
title: "CVE-2026-0545: mlflow: FastAPI job endpoints under `/ajax-api/3.0/jobs/*` are not protected by authentication or authorization"
url: https://erroneo.us/security/cve/CVE-2026-0545/
description: "CVE-2026-0545 (mlflow (PyPI)): In mlflow/mlflow, the FastAPI job endpoints under /ajax-api/3.0/jobs/ are not protected by authentication or authorization…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-04-03
date_modified: 2026-08-28
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-0545"
kev: false
cvss: 8.1
epss: 0.04392
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-0545: mlflow: FastAPI job endpoints under `/ajax-api/3.0/jobs/*` are not protected by authentication or authorization

**Signal:** Normal patch cycle. No exploitation signal; fix it in your next routine update if you are affected. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 4.4% , percentile 91: FIRST’s model estimates a 4.4% chance of exploitation activity in the next 30 days, higher than 91% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes mlflow (PyPI) <= 3.10.1, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it is

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 (MLFLOWSERVERENABLEJOBEXECUTION=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.

## Affected packages

- PyPI `mlflow` <= 3.10.1 → fixed: none listed

## Affected products (CVE record)

- mlflow mlflow/mlflow: unspecified <= latest

## Severity

- @huntr_ai CVSS 3.0: 9.1 `CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`
- redhat-SADP CVSS 3.1: 8.1 `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.1 `CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 4.39% probability of exploitation activity in the next 30 days; percentile 91.

## Sources

- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:60520)
- [GitHub Advisory GHSA-7qhf-v65m-g5f3](https://github.com/advisories/GHSA-7qhf-v65m-g5f3)
- [CVE.org record CVE-2026-0545](https://www.cve.org/CVERecord?id=CVE-2026-0545)
- [NVD entry CVE-2026-0545](https://nvd.nist.gov/vuln/detail/CVE-2026-0545)
- [huntr.com](https://huntr.com/bounties/b2e5b028-9541-4d29-8703-a76f1a3734d8)
- [access.redhat.com](https://access.redhat.com/security/cve/CVE-2026-0545)
- [RHBZ#2454889](https://bugzilla.redhat.com/show_bug.cgi?id=2454889)
- [security.access.redhat.com](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-0545.json)

---
Source page: https://erroneo.us/security/cve/CVE-2026-0545/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt