{"id":"CVE-2026-40302","state":"PUBLISHED","title":"zrok has reflected XSS in GitHub OAuth callback via unsanitized refreshInterval error rendering","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.","publishedAt":"2026-04-17T20:56:08.368Z","updatedAt":"2026-04-18T03:07:10.092Z","severity":{"score":6.1,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["openziti zrok"],"affected":[{"vendor":"openziti","product":"zrok","versions":[{"version":"< 2.0.1","status":"affected"}]}],"references":["https://github.com/openziti/zrok/security/advisories/GHSA-4fxq-2x3x-6xqx","https://github.com/openziti/zrok/releases/tag/v2.0.1"],"weaknesses":["CWE-79","CWE-116"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/40xxx/CVE-2026-40302.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-40302","state":"PUBLISHED","datePublished":"2026-04-17T20:56:08.368Z","dateUpdated":"2026-04-18T03:07:10.092Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-10T20:22:44.036Z"},"containers":{"cna":{"title":"zrok has reflected XSS in GitHub OAuth callback via unsanitized refreshInterval error rendering","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":[{"vendor":"openziti","product":"zrok","versions":[{"version":"< 2.0.1","status":"affected"}]}],"references":[{"url":"https://github.com/openziti/zrok/security/advisories/GHSA-4fxq-2x3x-6xqx","name":"https://github.com/openziti/zrok/security/advisories/GHSA-4fxq-2x3x-6xqx","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/openziti/zrok/releases/tag/v2.0.1","name":"https://github.com/openziti/zrok/releases/tag/v2.0.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-116","lang":"en","description":"CWE-116: Improper Encoding or Escaping of Output","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-17T20:56:08.368Z"},"source":{"advisory":"GHSA-4fxq-2x3x-6xqx","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-18T03:07:00.447331Z","id":"CVE-2026-40302","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-18T03:07:10.092Z"}}]}}}