---
title: "CVE-2026-64859: New API: User List API Leaks Root User Access Token Leading to Privilege Escalation"
url: https://erroneo.us/security/cve/CVE-2026-64859/
description: "CVE-2026-64859 (github.com/QuantumNous/new-api (Go)): New API is a large language mode (LLM) gateway and artificial intelligence (AI) asset management…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-08-17
date_modified: 2026-08-17
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-64859"
kev: false
cvss: 9.1
epss: 0.00626
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-64859: New API: User List API Leaks Root User Access Token Leading to Privilege Escalation

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.6% , percentile 49: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 49% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs an account (high (admin)). Exposure depends on who can log in.
- Only applies if your dependency tree includes github.com/QuantumNous/new-api (Go) < 1.0.0-rc.7, fixed in 1.0.0-rc.7 . Check your lockfile, including transitive dependencies.

## What it is

New API is a large language mode (LLM) gateway and artificial intelligence (AI) asset management system. Prior to 1.0.0-rc.7, the admin user list and user lookup APIs, including GET /api/user/, return User.AccessToken as accesstoken because User model objects are serialized after queries use Omit("password"), allowing an authenticated administrator to obtain the root user's bearer token and access root-only system configuration APIs. This issue is fixed in version 1.0.0-rc.7.

## Affected packages

- Go `github.com/QuantumNous/new-api` < 1.0.0-rc.7 → fixed: 1.0.0-rc.7

## Affected products (CVE record)

- QuantumNous new-api: < 1.0.0-rc.7

## Severity

- GitHub_M CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.63% probability of exploitation activity in the next 30 days; percentile 49.

## Sources

- [GitHub Advisory GHSA-6x2c-phff-wx57](https://github.com/advisories/GHSA-6x2c-phff-wx57)
- [CVE.org record CVE-2026-64859](https://www.cve.org/CVERecord?id=CVE-2026-64859)
- [NVD entry CVE-2026-64859](https://nvd.nist.gov/vuln/detail/CVE-2026-64859)
- [github.com](https://github.com/QuantumNous/new-api/security/advisories/GHSA-6x2c-phff-wx57)
- [github.com](https://github.com/QuantumNous/new-api/pull/4929)
- [github.com](https://github.com/QuantumNous/new-api/commit/0936e2504655a5cbf7bc3c388f6d3e2bb24916d3)
- [github.com](https://github.com/QuantumNous/new-api/releases/tag/v1.0.0-rc.7)

---
Source page: https://erroneo.us/security/cve/CVE-2026-64859/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt