{"id":"GHSA-3jpj-v3xr-5h6g","revision":"97d53f0deabf470392e518fa200b7a42","records":[{"revision":"97d53f0deabf470392e518fa200b7a42","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-3jpj-v3xr-5h6g","aliases":["CVE-2026-40304","GO-2026-5090"],"title":"zrok: Broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend records","description":"Summary\nThe 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.\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":[]}],"coverage":[]}