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, FortiSandbox PaaS 23.1 all versions, FortiSandbox PaaS 22.2 all versions, FortiSandbox PaaS 22.1 all versions, FortiSandbox PaaS 21.4 all versions, FortiSandbox PaaS 21.3 all versions, FortiSandbox PaaS 5.0.0 through 5.0.1, FortiSandbox PaaS 4.4.5 through 4.4.8 may allow an unauthenticated attacker to execute unauthorized code or commands via HTTP requests.
Vulnerability class: Broken Access Control
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (41.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.005 · change: -0.002
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)
References
- fortiguard.fortinet.com/psirt/FG-IR-26-136 (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.