CVE-2026-40304
zrok's broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend records
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.
INFO
Published Date :
April 17, 2026, 10:16 p.m.
Last Modified :
April 23, 2026, 6:33 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update zrok to version 2.0.1 or later.
- Verify the ownership guard logic.
- Remove any unauthorized global frontends.
- Monitor for unauthorized deletions.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-40304.
| URL | Resource |
|---|---|
| https://github.com/openziti/zrok/releases/tag/v2.0.1 | Release Notes |
| https://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6g | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-40304 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-40304
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40304 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-40304 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 23, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:netfoundry:zrok:*:*:*:*:*:*:*:* versions up to (excluding) 2.0.1 Added Reference Type GitHub, Inc.: https://github.com/openziti/zrok/releases/tag/v2.0.1 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6g Types: Vendor Advisory -
New CVE Received by [email protected]
Apr. 17, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-284 Added CWE CWE-863 Added Reference https://github.com/openziti/zrok/releases/tag/v2.0.1 Added Reference https://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6g