{"id":"CVE-2026-40302","sourceIdentifier":"security-advisories@github.com","published":"2026-04-17T21:16:34.997","lastModified":"2026-06-17T10:44:58.150","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"openziti","product":"zrok","versions":[{"version":"< 2.0.1","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","baseScore":6.1,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":2.7}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-18T03:07:00.447331Z","id":"CVE-2026-40302","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-79"},{"lang":"en","value":"CWE-116"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:netfoundry:zrok:*:*:*:*:*:*:*:*","versionEndExcluding":"2.0.1","matchCriteriaId":"70C6F018-6D34-4A75-A49D-A795B0A5B056"}]}]}],"references":[{"url":"https://github.com/openziti/zrok/releases/tag/v2.0.1","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/openziti/zrok/security/advisories/GHSA-4fxq-2x3x-6xqx","source":"security-advisories@github.com","tags":["Vendor Advisory"]}]}