CVE-2026-64859 New API: User List API Leaks Root User Access Token Leading to Privilege Escalation
An authenticated administrator can retrieve the root user's access token via the user list API, enabling privilege escalation to root-level system configuration access.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64859?
CVE-2026-64859 is a critical vulnerability in QuantumNous new-api, published on 17 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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 access_token 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.
Weakness: CWE-200
Which versions are affected by CVE-2026-64859?
3 open source packages ship an affected version, including github.com/QuantumNous/new-api.
| Package | Affected | Fixed in |
|---|---|---|
github.com/QuantumNous/new-api Go | All versions | 1.0.0-rc.7 |
github.com/QuantumNous/new-api Go | All versions | 1.0.0-rc.7 |
github.com/QuantumNous/new-api Go | All versions | 1.0.0-rc.7 |
How do I fix CVE-2026-64859?
Upgrade github.com/QuantumNous/new-api to 1.0.0-rc.7 or later.
Is CVE-2026-64859 being exploited?
There is no known exploitation of CVE-2026-64859 in the wild and no public exploit code.
Sources
Also known as GHSA-6x2c-phff-wx57, GO-2026-6240.