CVE-2026-40304
MediumVulnerability 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.
CVSS Metrics
Common Vulnerability Scoring System
Vector String:
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Severity Details
Weakness Type (CWE)
Improper Access Control
- Description
- The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
- Typical Severity
- Medium
- Abstraction Level
- Pillar
Key Information
- Published Date
- April 17, 2026
