Fortinet FortiSandbox OS Command Injection Vulnerability
A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox 4.2 all versions, FortiSandbox Cloud…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 4 / 5
- KEV catalog (CISA)16 Jul 2026
- Exploited in EUVD (ENISA)16 Jul 2026
- Used by ransomwareno
- EPSS above 10 %76.1%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: 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.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox 4.2 all versions, FortiSandbox Cloud 5.0.4 through 5.0.5, FortiSandbox PaaS 5.0.4 through 5.0.5 may allow an unauthenticated attacker to execute unauthorized commands via specifically crafted HTTP requests
Affected products
- 4.2.1 ≤4.2.8
- 5.0.0 ≤5.0.5
- 5.0.4 ≤5.0.5
- 4.4.0 ≤4.4.8
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
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EPSS peak: 76.1%
References
Other exploited vulnerabilities from the same vendor
- CVE-2025-61624Fortinet Multiple Products Path Traversal Vulnerability3.4 · Rising fast
- CVE-2026-104286Fortinet FortiMail Path Traversal Vulnerability5.9 · Actively exploited
- CVE-2025-25249Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability4.9 · Actively exploited
- CVE-2025-68686Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability5.4 · Actively exploited
- CVE-2026-39808Fortinet FortiSandbox OS Command Injection Vulnerability8.8 · Actively exploited
- CVE-2026-21643Fortinet FortiClient EMS SQL Injection Vulnerability9.0 · Background exploitation