CVE-2026-40304: Netfoundry Zrok

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Netfoundry Zrok: before 2.0.1 (fixed in 2.0.1)

Published 2026-04-17. Last modified 2026-06-17.