Vulnerability · Published Apr 17, 2026 · Assigned by GitHub_M

CVE-2026-40304zrok's broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend records

Medium 5.3

In plain English

A medium-severity improper access control in zrok from openziti. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.3%top 78.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/openziti/zrok	no fix listed	GHSA-3jpj-v3xr-5h6g
Go	github.com/openziti/zrok	no fix listed	GO-2026-5090
Go	github.com/openziti/zrok/v2	2.0.1	GHSA-3jpj-v3xr-5h6g
Go	github.com/openziti/zrok/v2	2.0.1	GO-2026-5090

Affected products (as reported)

Vendor	Product	Versions
openziti	zrok	< 2.0.1

Weakness: CWE-284, CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

References

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