# CVE-2026-40302

> Vulnerability · severity: **MEDIUM** (CVSS 6.1).

## 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.

## Key facts

- **CVE ID:** CVE-2026-40302
- **Published:** 2026-04-17
- **CVSS severity:** MEDIUM
- **CVSS base score:** 6.1
- **CWE codes:** CWE-79, CWE-116

## Affected products

- `netfoundry:zrok`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40302

## Citation

> AI Analytics. CVE-2026-40302. Retrieved 2026-07-18 from https://api.ai-analytics.org/cve/CVE-2026-40302. Derived from NIST NVD. Licensed CC0.

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