CVE-2026-115886: MLflow: SSRF on unauthenticated MLflow servers via third-party scorer kwargs in the scorer invoke, register, and GenAI evaluate endpoints

DescriptionCVE.org

MLflow is an open source AI engineering platform for agents, large language models, and machine learning models. From 3.12.0rc0 until 3.17.0, the scorer invoke, register, and GenAI evaluate endpoints, including unauthenticated POST /ajax-api/3.0/mlflow/scorer/invoke, accept serialized third-party scorer data that Scorer.model_validate_json resolves using a module-path allowlist without constraining the selected class or its constructor arguments. When optional trulens and trulens-providers-litellm packages are installed, an attacker can select mlflow.genai.scorers.trulens, choose a model URI outside MLflow's native provider registry so execution uses the LiteLLM fallback, and supply api_base and api_key values that cause the server to send an outbound request to an attacker-chosen or internal host with attacker-controlled headers and body. The vulnerable deserialization occurs before a tracking-store lookup or job submission. This issue is fixed in version 3.17.0.

• mlflow · mlflow>= 3.12.0rc0, < 3.17.0

Exploitation

Check available, not yet exploited. A public nuclei template can confirm it on a system you are authorised to test.

CISA KEV

Not listed

Public check

MLflow <3.17.0 - Unauthenticated SSRF via Third-Party (TruLens) Scorer · nuclei template in projectdiscovery/nuclei-templates

Weakness

Use of Externally-Controlled Input to Select Classes or Code · Command and Code Injection

Vendor

mlflow

Published

October 2026

Band

Check available, not yet exploited, October 2026

• NVD entrynvd.nist.gov
• CVE recordcve.org
• Weakness CWE-470cwe.mitre.org
• github.com/mlflow/mlflow/security/advisories/GHSA-2wqp-q3c6-ccj5github.com
• github.com/mlflow/mlflow/pull/25890github.com
• github.com/mlflow/mlflow/commit/bac30b4148c4f40045b4d4db07ae60abgithub.com
• github.com/mlflow/mlflow/releases/tag/v3.17.0github.com