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CVE-2026-40304

zrok's broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend records

MEDIUM
5.3
CVSS Score
Published: April 17, 2026 at 09:04 PM UTC
Updated: June 17, 2026 at 10:44 AM UTC
2 products affected across 2 vendorsZrokZrok

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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. Version 2.0.1 patches the issue.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Zrok· Netfoundry
95%
v < 2.0.1
Zrok· Openziti
60%
v < 2.0.1
Affected range stops below 2.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_CONFIRMVendor Advisory
Source: cverecord
https://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6g
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/openziti/zrok/releases/tag/v2.0.1

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-284CWE-863

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