CVE-2026-39808
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>
In plain language
AI Act nowCVE-2026-39808 is a severe command-injection flaw in Fortinet FortiSandbox (4.4.0 through 4.4.8) that has reports of active real-world exploitation, so most small businesses using these systems should treat it as an urgent patch-now issue.
What to do
- Update FortiSandbox to a fixed version as soon as your vendor releases/approves it. 2) If you can’t update immediately, ask your IT/security person to temporarily limit access to FortiSandbox (reduce who/what can reach it) and monitor for suspicious activity targeting the sandbox. 3) Check whether you are running Fortinet FortiSandbox (including Fortinet FortiSandbox PaaS) and confirm the exact version number.
CVSS Vector Breakdown
AV:NAttack VectorAC:LAttack ComplexityPR:NPrivileges RequiredUI:NUser InteractionS:UScopeC:HConfidentialityI:HIntegrityA:HAvailabilityWeaknesses
Affected Products
Exploitability
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Attack Graph
Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.
MITRE ATT&CK
1 techniqueReferences
- 200 new CVEs a day and no realistic way to patch them allen-us·Help Net Security· Research ai-ml
- New InfraTrust report reveals infrastructure flaws admins should patch firsten-us·BleepingComputer· Exploited SMA1000 Volt Typhoon
- Fresh SharePoint Vulnerability Exploited Soon After Disclosureen-us·SecurityWeek· Exploited SharePoint Server Subscription Edition rce
- CISA urges immediate action on actively exploited Fortinet flawsen-us·BleepingComputer· Exploited FortiSandbox rce
- CISA Adds Exploited SharePoint RCE Zero-Day CVE-2026-58644 to KEVen·The Hacker News· Exploited SharePoint Server Subscription Edition rce
- 22nd June – Threat Intelligence Reporten-us·Check Point Research· Roundup Fortinet FortiSandbox Icarus
- 3 Recently Patched Fortinet FortiSandbox Vulnerabilities in Hacker Crosshairsen-us·SecurityWeek· Exploited FortiSandbox rce
- Attackers Exploit Three Fortinet FortiSandbox Flaws, One Patched Last Weeken·The Hacker News· Exploited FortiSandbox rce
- Critical Fortinet FortiSandbox flaws now exploited in attacksen-us·BleepingComputer· Exploited FortiSandbox rce
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