SecuriTricks - CVE-2026-40304

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.

Product(s) Impacted

Vendor	Product	Versions
Zrok	Zrok	*

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-284

Improper Access Control

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	zrok	zrok	/	/	/	/	/	/	/	/

References

https://github.com/openziti/zrok/releases/tag/v2.0.1

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

CVSS Score

5.3 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: HIGH
Privileges Required: LOW
Scope: UNCHANGED
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: HIGH

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

View Vector String

Timeline

Published: April 17, 2026, 10:16 p.m.
Last Modified: April 17, 2026, 10:16 p.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

CVE-2026-40304