CVE-2026-40302: Netfoundry Zrok

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Netfoundry Zrok: before 2.0.1 (fixed in 2.0.1)

Published 2026-04-17. Last modified 2026-06-17.