What is CVE-2026-40304?

CVE-2026-40304 is a medium-severity vulnerability in Openziti 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 Openziti 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: 0.000 (3.5th 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

Openziti Zrok — versions < 2.0.1

Weakness classification (CWE)

References

https://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6g (x_refsource_CONFIRM)
https://github.com/openziti/zrok/releases/tag/v2.0.1 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-40304?: CVE-2026-40304 is a medium-severity vulnerability in Openziti 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.