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CVE-2026-39808

Fortinet · FortiSandbox · Fortinet FortiSandbox OS Command Injection Vulnerability

· Added to CISA KEV
CVSS
Severityhigh
Weakness
ExploitedYes, in CISA KEV
Ransomware useUnknown
Federal fix dueJul 19, 2026

Description

Fortinet FortiSandbox contains an OS command injection vulnerability that could allow an unauthenticated attacker to execute unauthorized code or commands via crafted HTTP requests.

Required action (CISA)

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.

References

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Our coverage of CVE-2026-39808

CVE-2008-4128high

July 2026 CVE Landscape

In July 2026, a significant increase in high-impact vulnerabilities was observed, with 85 critical flaws identified, 36 of which had a Very Critical Recorded Future Risk Score. A notable portion of these vulnerabilities were either already listed in CISA's Known Exploited Vulnerabilities catalog or were reported by vendors. The vulnerabilities affected a wide range of products from 61 vendors, with Microsoft products being the most frequently impacted.

CVE-2026-25089critical

CISA Adds Fortinet and Microsoft Flaws to Exploited Vulnerabilities List

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added critical vulnerabilities affecting Fortinet FortiSandbox and Microsoft SharePoint to its Known Exploited Vulnerabilities catalog. The flaws include OS command injection in FortiSandbox and a deserialization vulnerability in SharePoint that allows for remote code execution without authentication. Microsoft has confirmed active exploitation of the SharePoint flaw.