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CVE-2026-40302— zrok has reflected XSS in GitHub OAuth callback via unsanitized refreshInterval error rendering

CVSS 6.1 · Medium EPSS 0.01% · P1
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I. Basic Information for CVE-2026-40302

Vulnerability Information
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Vulnerability Title
zrok has reflected XSS in GitHub OAuth callback via unsanitized refreshInterval error rendering
Source: NVD (National Vulnerability Database)
Vulnerability Description
zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the proxyUi template engine uses Go's text/template (which performs no HTML escaping) instead of html/template. The GitHub OAuth callback handlers in both publicProxy and dynamicProxy embed the attacker-controlled refreshInterval query parameter verbatim into an error message when time.ParseDuration fails, and render that error unescaped into HTML. An attacker can deliver a crafted login URL to a victim; after the victim completes the GitHub OAuth flow, the callback page executes arbitrary JavaScript in the OAuth server's origin. Version 2.0.1 patches the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
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，该漏洞源于使用text/template模板引擎且未对refreshInterval参数进行转义，可能导致跨站脚本攻击。
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

VendorProductAffected VersionsCPESubscribe
openzitizrok < 2.0.1 -

II. Public POCs for CVE-2026-40302

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III. Intelligence Information for CVE-2026-40302

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

CVE-2026-403037.5 HIGHzrok allows unauthenticated DoS via unbounded memory allocation in striped session cookie
CVE-2026-403045.3 MEDIUMzrok's broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global

IV. Related Vulnerabilities

Same product: zrok
Same vendor: openziti
Same weakness: CWE-79

V. Comments for CVE-2026-40302

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