{"id":"CVE-2026-40304","sourceIdentifier":"security-advisories@github.com","published":"2026-04-17T22:16:32.230","lastModified":"2026-06-17T10:44:58.387","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 unaccess handler (controller/unaccess.go) contains a logical error in its ownership guard: when a frontend record has environment_id = NULL (the marker for admin-created global frontends), the condition short-circuits to false and allows the deletion to proceed without any ownership verification. A non-admin user who knows a global frontend token can call DELETE /api/v2/unaccess with any of their own environment IDs and permanently delete the global frontend, taking down all public shares routed through it. 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:H/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.6,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-20T14:51:35.879686Z","id":"CVE-2026-40304","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-284"},{"lang":"en","value":"CWE-863"}]}],"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-3jpj-v3xr-5h6g","source":"security-advisories@github.com","tags":["Vendor Advisory"]}]}