What is CVE-2026-40304?

CVE-2026-40304 is a medium-severity vulnerability in Netfoundry Zrok, classified under Improper Access Control. CVSS score: 5.3/10. Published 2026-04-17.

How severe is CVE-2026-40304?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in Netfoundry Zrok

CVE-2026-40304

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 = NUL…

EPSS: 0.003 (20.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Netfoundry Zrok
Openziti Zrok — versions < 2.0.1

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-40304?: CVE-2026-40304 is a medium-severity vulnerability in Netfoundry Zrok, classified under Improper Access Control. CVSS score: 5.3/10. Published 2026-04-17.
How severe is CVE-2026-40304?: Medium severity. CVSS v3 base score is 5.3 out of 10.