{"id":"EUVD-2026-23551","revision":null,"records":[{"revision":"7a8dab9b8ba34b30822092daa40ced5e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-40304","aliases":[],"title":"zrok's broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend records","description":"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. 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Version 2.0.1 patches the issue.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.3,"severity":null}],"references":["https://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6g","https://github.com/openziti/zrok/releases/tag/v2.0.1"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-23551","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Apr 17, 2026, 9:04:23 PM","dateUpdated":"Apr 20, 2026, 2:57:24 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. 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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.","state":0,"publishedAt":"2026-04-17T22:16:32.23+00:00","modifiedAt":"2026-10-26T22:10:00.163+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/openziti/zrok/releases/tag/v2.0.1","https://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6g"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-40304","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-284","CWE-863"],"productCriteria":["cpe:2.3:a:netfoundry:zrok:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-04-17T22:16:32.230","lastModified":"2026-10-26T22:10:00.163"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. 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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.\n\nAttack Vector: Network — the endpoint is a standard HTTP API call.\n\nAttack Complexity: High — successful exploitation requires prior knowledge of a global frontend token. These tokens are not returned to non-admin users by any standard API endpoint; obtaining one requires an out-of-band step (e.g., leaked server logs, admin documentation for a self-hosted instance, or social engineering).\n\nPrivileges Required: Low — a valid user account with at least one registered environment is required; no admin privileges needed.\n\nUser Interaction: None.\n\nScope: Unchanged — the impact stays within the same server instance.\n\nConfidentiality Impact: None — no data is disclosed.\n\nIntegrity Impact: None — no data is improperly modified; the record is deleted (not corrupted).\n\nAvailability Impact: High — deleting a global frontend disrupts every public share routed through it on the instance, constituting a platform-wide availability impact.\n\nAffected Component\ncontroller/unaccess.go — unaccessHandler.Handle (line 56)","state":0,"publishedAt":"2026-04-16T21:09:23+00:00","modifiedAt":"2026-06-25T18:56:36.803354+00:00","affected":[{"ecosystem":"Go","name":"github.com/openziti/zrok","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"last_affected","version":"1.1.11"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/openziti/zrok/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.0.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6g","https://nvd.nist.gov/vuln/detail/CVE-2026-40304","https://github.com/openziti/zrok","https://github.com/openziti/zrok/releases/tag/v2.0.1"],"sourceUrl":"https://github.com/advisories/GHSA-3jpj-v3xr-5h6g","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-3jpj-v3xr-5h6g","identifiers":["GHSA-3jpj-v3xr-5h6g","CVE-2026-40304","GO-2026-5090"]},"retained":false,"historicalAffected":[]},{"revision":"aefd77c5251d430ba9812384867d4a3d","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5090","aliases":["CVE-2026-40304","GHSA-3jpj-v3xr-5h6g"],"title":"zrok: Broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend records in github.com/openziti/zrok","description":"zrok: Broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend records in github.com/openziti/zrok","state":0,"publishedAt":"2026-06-25T18:26:48+00:00","modifiedAt":"2026-06-25T18:45:17.9360465+00:00","affected":[{"ecosystem":"Go","name":"github.com/openziti/zrok","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/openziti/zrok/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.0.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6g","https://nvd.nist.gov/vuln/detail/CVE-2026-40304","https://github.com/openziti/zrok/releases/tag/v2.0.1"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5090","license":"OSV · upstream source license applies","key":"osv:GO-2026-5090","identifiers":["GO-2026-5090","CVE-2026-40304","GHSA-3jpj-v3xr-5h6g"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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