CVE-2026-40304

MEDIUM 5.3

zrok's broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend records

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-284 CWE-863
Vendor	openziti
Product	zrok
Published	Apr 17, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

openziti / zrok

< 2.0.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6g github.com: https://github.com/openziti/zrok/releases/tag/v2.0.1