CVE-2026-40302
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/openziti/zrokGo | <= 1.1.11 | — |
github.com/openziti/zrok/v2Go | < 2.0.1 | 2.0.1 |
Affected products
3- ghsa-coords2 versions
<= 1.1.11+ 1 more
- (no CPE)range: <= 1.1.11
- (no CPE)range: < 2.0.1
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-4fxq-2x3x-6xqxghsaADVISORY
- github.com/openziti/zrok/security/advisories/GHSA-4fxq-2x3x-6xqxnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-40302ghsaADVISORY
- github.com/openziti/zrok/releases/tag/v2.0.1nvdRelease NotesWEB
News mentions
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