CVE-2026-40304

MEDIUM5.3EPSS 0.01%

zrok: Broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend records

發布日:2026/4/16修改日:2026/5/5

描述

Summary 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. Attack Vector: Network — the endpoint is a standard HTTP API call. Attack 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). Privileges Required: Low — a valid user account with at least one registered environment is required; no admin privileges needed. User Interaction: None. Scope: Unchanged — the impact stays within the same server instance. Confidentiality Impact: None — no data is disclosed. Integrity Impact: None — no data is improperly modified; the record is deleted (not corrupted). Availability Impact: High — deleting a global frontend disrupts every public share routed through it on the instance, constituting a platform-wide availability impact. Affected Component controller/unaccess.go — unaccessHandler.Handle (line 56)

受影響套件(2)

CVSS 分數

來源版本嚴重程度向量
osvCVSS 3.1MEDIUM5.3CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

參考連結(4)