What is CVE-2026-26083?

CVE-2026-26083 is a critical-severity vulnerability in Fortinet Fortisandbox, classified under Missing Authorization. CVSS score: 9.8/10. Published 2026-05-12.

How severe is CVE-2026-26083?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Fortinet Fortisandbox

CVE-2026-26083

A missing authorization vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.1, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox Cloud 5.0.2 through 5.0.5, FortiSandbox PaaS 23.4 all versions, FortiSandbox PaaS 23.3 all versions, FortiSa…

Vulnerability class: Broken Access Control

EPSS: 0.001 (20.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Fortinet Fortisandbox — versions 5.0.0, 4.4.0, 4.2.1
Fortinet Fortisandbox Cloud — versions 5.0.0, 4.4.5
Fortinet Fortisandbox_cloud — versions 24.1.4436
Fortinet Fortisandbox Paas — versions 23.4.4374, 23.4.4350, 23.3.4329
Fortinet Fortisandbox_paas

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

psirt@fortinet.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-26083?: CVE-2026-26083 is a critical-severity vulnerability in Fortinet Fortisandbox, classified under Missing Authorization. CVSS score: 9.8/10. Published 2026-05-12.
How severe is CVE-2026-26083?: Critical severity. CVSS v3 base score is 9.8 out of 10.