CVE-2026-40304

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

State: Published
Severity: 5.3 Medium
Published: Apr 17, 2026
Updated: Apr 20, 2026
Reserved: Apr 10, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-284 Improper Access Control
CWE-863 Incorrect Authorization

Affected Products

Product	Versions
zrokopenziti	< 2.0.1Affected

References

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