# CVE-2026-40304

> Vulnerability · severity: **MEDIUM** (CVSS 5.3).

## Description

zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the unaccess handler (controller/unaccess.go) contains a logical error in its ownership guard: when a frontend record has environment_id = NULL (the marker for admin-created global frontends), the condition short-circuits to false and allows the deletion to proceed without any ownership verification. A non-admin user who knows a global frontend token can call DELETE /api/v2/unaccess with any of their own environment IDs and permanently delete the global frontend, taking down all public shares routed through it. Version 2.0.1 patches the issue.

## Key facts

- **CVE ID:** CVE-2026-40304
- **Published:** 2026-04-17
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.3
- **CWE codes:** CWE-284, CWE-863

## Affected products

- `netfoundry:zrok`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40304

## Citation

> AI Analytics. CVE-2026-40304. Retrieved 2026-07-19 from https://api.ai-analytics.org/cve/CVE-2026-40304. Derived from NIST NVD. Licensed CC0.

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