Vulnerability report

Exploitation attempts observed Confirmed confidence Not in CISA KEV

CVE-2026-116690

mlflow Arbitrary File Access

Mlflow · >= 3.10.0, < 3.17.0

Watch CVE-2026-116690 Browse KEV feed
Severity
CVSS 7.5 · High
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
0.6%
First observed
27 Oct 2026
Last observed
29 Oct 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-116690 is an unauthenticated vulnerability affecting mlflow. MLflow is an open source AI engineering platform for agents, large language models, and machine learning models. From 3.10.0 until 3.17.0, the...

Have exploitation attempts been observed?

Yes. Previdian sensors have observed 108 exploitation attempts, 11 unique attacker IPs, and 7 countries targeting CVE-2026-116690. First observed Oct 27, 2026; last observed Oct 29, 2026. Confidence is confirmed.

Who is affected?

mlflow >= 3.10.0, < 3.17.0.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

MLflow is an open source AI engineering platform for agents, large language models, and machine learning models

MLflow is an open source AI engineering platform for agents, large language models, and machine learning models. From 3.10.0 until 3.17.0, the prompt branch in _create_model_version() accepts schemeless relative sources because path validation runs only when a source has a URL scheme, and mlflow.prompt.is_prompt is interpreted by tag presence rather than a true value. A remote caller can store a server-local path as the model version artifact location and use /api/2.0/mlflow/model-versions/get-artifact to read files accessible to the MLflow server process.

Default unauthenticated servers require no privileges, while basic-auth deployments are exposed to authenticated users who can create registered models. This issue is fixed in version 3.17.0.

mlflow Affected
mlflow
>= 3.10.0, < 3.17.0
Published
27 Oct 2026
Exploitation Attempts Reported
27 Oct 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

CVE References

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation attempts observed in the wild

Previdian

Recorded 27 Oct 2026

Previdian sensors observed exploitation attempts targeting this vulnerability.

Exploitation attempts observed

Previdian sensor

First observed 27 Oct 2026

Previdian sensors observed exploitation attempts targeting this vulnerability.

Proof of concept available

GitHub Advisory Database

Recorded 27 Oct 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
Previdian Sensors First 2026-10-28 08:14 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

Previdian Sensor Observations

Previdian sensor observations are exploitation attempts targeting this vulnerability. They do not show that the target was vulnerable or that the attempt succeeded. The cards and chart show volume, unique attackers, and daily activity.

108

Attempts observed

11

Unique attacker IPs

7

Attacker countries

AU · DE · HK · IN · NL · SG · US

4

Sensors observed

CVE-2026-116690 exploitation attempts over the last 7 days

Daily events observed by Previdian sensors

Updated 29 Oct 2026

0
0
0
0
19
0
89
23 Oct 24 Oct 25 Oct 26 Oct 27 Oct 28 Oct 29 Oct

First observed 27 Oct 2026 · Last observed 29 Oct 2026

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
1
15
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

Previdian virtual patch guidance is available for this CVE.

AWS WAF Cloudflare ModSecurity

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

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Virtual Patch Detail

Compensating WAF rules for this CVE.

Available

Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to Previdian Enterprise users.

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Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.5 High

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

0.6%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') CWE-22

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

https://github.com/mlflow/mlflow/security/advisories/GHSA-m65p-9j7q-6w33

ghsa · Created Unknown · AI assessment 96%

MLflow vulnerable to arbitrary file read on unauthenticated servers via prompt model version source

Timeline

From disclosure to observed exploitation attempts

  1. 00:00 UTC

    Virtual patch available

    Compensating WAF rule available to block exploitation

  2. 23:30 UTC

    Indicators of compromise added (11)

    Indicators of compromise recorded

  3. 23:30 UTC

    Observed by Previdian sensors

    Previdian sensors observed exploitation attempts targeting this vulnerability.

  4. 22:11 UTC

    Public PoC available

    Public proof-of-concept code published

  5. 20:20 UTC

    Added to the Previdian watchlist

    Pro and Enterprise Watch users had 1 day of early warning before Previdian confirmed it as a KEV.

  6. 19:42 UTC

    CVE published

    Vulnerability disclosed publicly

  7. 20:00 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-116690

Sample API response 
{
  "cve_id": "CVE-2026-116690",
  "confidence": "Confirmed",
  "cvss_score": 7.5,
  "cvss_estimated": false,
  "epss_score": 0.00559,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 108, "sensors": 4 }
}