What is CVE-2026-26084?

CVE-2026-26084 is a critical-severity vulnerability in Fortinet Fortisandbox, classified under Improper Access Control. CVSS score: 9.9/10. Published 2026-09-08.

How severe is CVE-2026-26084?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Vulnerability in Fortinet Fortisandbox

CVE-2026-26084

A improper access control vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox Cloud 5.0.4 through 5.0.5, FortiSandbox PaaS 5.0.4 through 5.0.5 may allow attacker to access sensitive information via crafted HTTP requests.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H.

Affected products

Fortinet Fortisandbox
Fortinet Fortisandbox Cloud
Fortinet Fortisandbox Paas

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

psirt@fortinet.com

Frequently asked questions

What is CVE-2026-26084?: CVE-2026-26084 is a critical-severity vulnerability in Fortinet Fortisandbox, classified under Improper Access Control. CVSS score: 9.9/10. Published 2026-09-08.
How severe is CVE-2026-26084?: Critical severity. CVSS v3 base score is 9.9 out of 10.