CVE-2026-40304 | openziti zrok up to 2.0.0 controller/unaccess.go environment_id access control

VDB-358126 · CVE-2026-40304 · GCVE-0-2026-40304 OPENZITI ZROK UP TO 2.0.0 CONTROLLER/UNACCESS.GO ENVIRONMENT_ID ACCESS CONTROL HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.1 $0-$5k 2.44+ Summaryinfo A vulnerability was found in openziti zrok up to 2.0.0. It has been declared as critical. Affected is an unknown function of the file controller/unaccess.go. Executing a manipulation of the argument environment_id can lead to access control. This vulnerability is handled as CVE-2026-40304. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component. Detailsinfo A vulnerability was found in openziti zrok up to 2.0.0. It has been declared as problematic. This vulnerability affects some unknown processing of the file controller/unaccess.go. The manipulation of the argument environment_id with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect availability. CVE summarizes: 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. The advisory is available at github.com. This vulnerability was named CVE-2026-40304 since 04/10/2026. The exploitation appears to be difficult. The attack can be initiated remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project. Upgrading to version 2.0.1 eliminates this vulnerability. Productinfo Vendor openziti Name zrok Version 2.0 Website Product: https://github.com/openziti/zrok/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 4.2 VulDB Meta Temp Score: 4.1 VulDB Base Score: 3.1 VulDB Temp Score: 3.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.3 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Access control CWE: CWE-284 / CWE-266 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: zrok 2.0.1 Timelineinfo 04/10/2026 CVE reserved 04/17/2026 +7 days Advisory disclosed 04/17/2026 +0 days VulDB entry created 04/17/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-40304 (🔒) GCVE (CVE): GCVE-0-2026-40304 GCVE (VulDB): GCVE-100-358126 Entryinfo Created: 04/17/2026 23:51 Changes: 04/17/2026 23:51 (65) Complete: 🔍 Cache ID: 99:FF3:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸