Is CVE-2026-40304 actively exploited?

No active exploitation of CVE-2026-40304 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40304 be exploited remotely?

Yes. CVE-2026-40304 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40304?

CVE-2026-40304 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-40304

CWE-284Published: April 17, 2026· Updated: Apr 23, 2026

5.3

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:1.5th

Official 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.

NVD Source

Technical Analysis

CVE-2026-40304 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.3.