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

Quick assessment

Affected
openziti zrok
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

zrok是OpenZiti开源的一个安全的互联网共享工具。 zrok 2.0.1之前版本存在安全漏洞，该漏洞源于unaccess处理程序存在逻辑错误，可能导致非管理员用户删除全局前端。

CVSS 5.3 · Medium EPSS 0.36% · P28
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I. Basic Information for CVE-2026-40304

Vulnerability Information
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Vulnerability Title
zrok's broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend records
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
zrok 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zrok是OpenZiti开源的一个安全的互联网共享工具。 zrok 2.0.1之前版本存在安全漏洞，该漏洞源于unaccess处理程序存在逻辑错误，可能导致非管理员用户删除全局前端。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
openziti zrok < 2.0.1 -

II. Public POCs for CVE-2026-40304

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III. Intelligence Information for CVE-2026-40304

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Same Patch Batch · openziti · 2026-04-17 · 3 CVEs total

CVE-2026-40303 7.5 HIGH zrok allows unauthenticated DoS via unbounded memory allocation in striped session cookie
CVE-2026-40302 6.1 MEDIUM zrok has reflected XSS in GitHub OAuth callback via unsanitized refreshInterval error rend

IV. Related Vulnerabilities

Same product: zrok
Same vendor: openziti
Same weakness: CWE-284

V. Comments for CVE-2026-40304

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