CVE-2026-0545 Missing Authentication for Critical Function in mlflow/mlflow
Unauthenticated attackers can execute jobs in MLflow when basic-auth is enabled, potentially leading to remote code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-0545?
CVE-2026-0545 is a critical missing authorization vulnerability in Lfprojects Mlflow, published on 3 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-306
Which versions are affected by CVE-2026-0545?
3 open source packages ship an affected version, including mlflow. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mlflow PyPI | All versions to 3.10.1 | None |
mlflow PyPI | All versions to 3.10.1 | None |
mlflow PyPI | All versions to 3.10.1 | None |
Products include Lfprojects Mlflow.
How do I fix CVE-2026-0545?
No fix has been published for CVE-2026-0545 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-0545 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-0545 exists.
Public exploit code: 1 Nuclei template.
Other vulnerabilities in Lfprojects Mlflow
- CVE-2026-64849 MLflow Server-Side Request Forgery
- CVE-2025-15379 Command Injection in mlflow/mlflow
- CVE-2024-0520 Remote Code Execution due to Full Controlled File Write in mlflow/mlflow
- CVE-2023-6977 Path Traversal: '\..\filename'
- CVE-2023-6709 Improper Neutralization of Special Elements Used in a Template Engine in mlflow/mlflow
Sources
Also known as GHSA-7qhf-v65m-g5f3, MINI-54gx-rj97-rrc8, PYSEC-2026-419.