Is CVE-2026-39808 in the CISA KEV catalog?

Yes. CVE-2026-39808 is on the CISA Known Exploited Vulnerabilities list, added 2026-07-16.

What is the CVSS severity of CVE-2026-39808?

CVE-2026-39808 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2026-39808?

CVE-2026-39808 has an EPSS score of 84.16% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-39808?

No published fix for CVE-2026-39808 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2026-07-19. Apply the vendor's mitigations per CISA's guidance.

CVE & CISA-KEV Catalog

CVE-2026-39808

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

Description

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>

CWE-78OS Command Injection

How to fix

Actively exploited, no published fix found yet

Federal remediation due: 2026-07-19

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

84.16%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-07-19

References

Exploit1

github.com

Vendor Advisory1

fortiguard.fortinet.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-78 (OS Command Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-1498	Critical	9.8	100%	KEV	Fix
CVE-2014-6271	Critical	9.8	100%	KEV	Fix
CVE-2019-16920	Critical	9.8	100%	KEV	-
CVE-2022-44877	Critical	9.8	100%	KEV	Fix
CVE-2020-8515	Critical	9.8	100%	KEV	-
CVE-2020-9054	Critical	9.8	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-17.