---
id: CVE-2025-27621
title: >-
  UpTrain is an open-source platform to evaluate and improve generative AI
  applications
summary: >-
  UpTrain is an open-source platform to evaluate and improve generative AI
  applications. In version 0.7.1 and prior, the UpTrain backend creates a new
  default user with a static username, where the username is also used as the
  default API …
severity: none
cwe:
  - CWE-287
published: '2026-08-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-27621'
references:
  - url: >-
      https://github.com/uptrain-ai/uptrain/blob/a31cc14eddcb6c0b0b12cbed15f086d98c441c6f/uptrain/dashboard/backend/app.py#L105
    label: security-advisories@github.com
  - url: >-
      https://securitylab.github.com/advisories/GHSL-2024-198_GHSL-2024-199_Uptrain/
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00458
epssPercentile: 0.37109
ingestedAt: '2026-09-18T20:51:25.619Z'
---

## Overview

UpTrain is an open-source platform to evaluate and improve generative AI applications. In version 0.7.1 and prior, the UpTrain backend creates a new default user with a static username, where the username is also used as the default API key. The UpTrain backend also has an open CORS policy. Using these two primitives, any website can make a authenticated cross-origin request to the UpTrain instance by providing the default API key in the header `uptrain-access-token`. This issue may allow arbitrary websites to perform privileged operations on the UpTrain instance, as if they were the default logged in user. As of time of publication, no known patches are available.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.