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CVE-2026-39808

critical

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>

References

https://www.bleepingcomputer.com/news/security/new-infratrust-report-reveals-infrastructure-flaws-admins-should-patch-first/

https://securityaffairs.com/195569/security/u-s-cisa-adds-fortinet-fortisandbox-and-microsoft-sharepoint-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.theregister.com/security/2026/07/17/attackers-target-critical-fortisandbox-flaws-as-cisa-issues-patch-order/5274287

https://www.securityweek.com/fresh-sharepoint-vulnerability-exploited-soon-after-disclosure/

https://www.infosecurity-magazine.com/news/cisa-urgent-patch-fortinet/

https://www.databreachtoday.com/cisa-adds-fortisandbox-bugs-to-kev-catalog-a-32260

https://www.bleepingcomputer.com/news/security/cisa-warns-feds-to-patch-exploited-fortinet-fortisandbox-flaws-by-sunday/

https://thehackernews.com/2026/07/cisa-adds-exploited-sharepoint-rce-zero.html

https://www.cisa.gov/news-events/alerts/2026/07/16/cisa-adds-three-known-exploited-vulnerabilities-catalog

https://www.securityweek.com/3-recently-patched-fortinet-fortisandbox-vulnerabilities-in-hacker-crosshairs/

https://cyberscoop.com/fortinet-fortisandbox-vulnerabilities-exploits/

https://www.theregister.com/security/2026/06/16/three-critical-fortinet-sandbox-bugs-splattered-by-unknown-attackers/5256461

https://www.helpnetsecurity.com/2026/06/16/fortisandbox-vulnerabilities-cve-2026-39813-cve-2026-39808-cve-2026-25089/

https://www.bleepingcomputer.com/news/security/critical-fortinet-fortisandbox-flaws-now-exploited-in-attacks/

https://thehackernews.com/2026/06/attackers-exploit-three-fortinet.html

https://securityaffairs.com/193709/ai/fortinet-warned-as-three-critical-fortisandbox-bugs-come-under-attack.html

https://www.helpnetsecurity.com/2026/04/16/fortinet-fortisandbox-vulnerabilities-cve-2026-39813-cve-2026-39808/

https://www.theregister.com/2026/04/15/critical_fortinet_sandbox_bugs/

https://www.securityweek.com/fortinet-patches-critical-fortisandbox-vulnerabilities/

https://thehackernews.com/2026/04/april-patch-tuesday-fixes-critical.html

https://github.com/HORKimhab/CVE-2026-39808

https://github.com/Neverland-lcl/Security_OS_CVE

https://github.com/Neverland-lcl/Security_OS

https://github.com/ynsmroztas/FortiSandbox-RCE-Exploit-CVE-2026-39808

https://github.com/Lechansky/CVE-2026-39808

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39808

https://fortiguard.fortinet.com/psirt/FG-IR-26-100

Details

Source: Mitre, NVD

Published: 2026-04-14

Updated: 2026-07-17

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

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

Severity: Critical

EPSS

EPSS: 0.92819

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest