CVE-2026-40302
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.
- CVSS 3.1
- 6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 10% of CVEs (scores of 2026-10-26)
- CWEs
- CWE-79, CWE-116
- Published
- Modified
- Record from
- the NVD, synced
Affected
- netfoundry:zrok
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-4fxq-2x3x-6xqx | Go | github.com/openziti/zrok | <=1.1.11 | no fix published |
| GHSA-4fxq-2x3x-6xqx | Go | github.com/openziti/zrok/v2 | <2.0.1 | 2.0.1 |
| GO-2026-5118 | Go | github.com/openziti/zrok | all versions | no fix published |
| GO-2026-5118 | Go | github.com/openziti/zrok/v2 | <2.0.1 | 2.0.1 |