CVE-2026-2611: In MLflow version 3.9.0, the MLflow Assistant feature introduced improper origin validation in its /ajax-api e

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CRITICAL 9.6UPGRADE

CVE-2026-2611 is a critical-severity flaw (CVSS 9.6) affecting mlflow. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In MLflow version 3.9.0, the MLflow Assistant feature introduced improper origin validation in its /ajax-api endpoints. This vulnerability allows a remote attacker to exploit cross-origin requests from a malicious webpage to interact with the MLflow Assistant running on a victim's local machine. By bypassing the loopback-only restriction, the attacker can modify the Assistant's configuration to enable full access, which in turn allows the executi

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-346, CWE-940
Published	2026-05-19
Last modified	2026-10-14

Publisher (CNA): huntr.dev · Vendor: lfprojects

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-19 10:16 UTCPublished CVE record published
2026-10-14 20:10 UTCUpdated Record last modified

lfprojects mlflow UPGRADE

Affected: >= 3.9.0 and < 3.10.0

Fixed in: 3.10.0

Safe to downgrade to: a release before 3.9.0

1. Check installed version

apt-cache policy mlflow || rpm -q mlflow || mlflow --version

2. UPGRADE to 3.10.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mlflow

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mlflow

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.9.0 (Debian / Ubuntu)

apt-cache madison mlflow sudo apt install mlflow=<VERSION_BEFORE_3.9.0> sudo apt-mark hold mlflow

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mlflow sudo dnf downgrade mlflow-<VERSION_BEFORE_3.9.0> sudo dnf versionlock add mlflow

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-2611?

mlflow: upgrade to 3.10.0. Exact commands for each OS are on this page.

Is CVE-2026-2611 being exploited?

CVE-2026-2611 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-2611 affect?

CVE-2026-2611 affects mlflow. Severity is critical (CVSS 9.6). In MLflow version 3.9.0, the MLflow Assistant feature introduced improper origin validation in its /ajax-api endpoints. This vulnerability allows a remote attacker to exploit cross-origin requests from a malicious webpage to interact with t

How urgent is CVE-2026-2611?

Priority 47/100. Critical severity; Public exploit reference

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References

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