CVE-2026-39808

A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 4.4.0 through 4.4.8 may allow attacker to execute unauthorized code or commands via <insert attack vector here>

Published: 2026-04-14 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-39808 is rated High Risk (78.9/100): CVSS Critical severity, with high exploitation likelihood (EPSS 66.17%, 99th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +49.49% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-39808

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 16.68% 66.17% +49.49%
2 2026-06-12 21.10% 16.68% -4.42%
3 2026-06-11 — 21.10% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-39808

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2026-39808

GitHub Security Advisory for CVE-2026-39808

GHSA-wfjv-vrx5-2cf2 · Severity: critical — A improper neutralization of special elements used in an os command ('os command injection')...

Affected software / configurations for CVE-2026-39808

Vendor Product Version Raw CPE
fortinet fortisandbox >= 4.4.0, <= 4.4.9 cpe:2.3:a:fortinet:fortisandbox:*:*:*:*:*:*:*:*

References for CVE-2026-39808

cvelogic Threat Intelligence