CVE-2026-39808

CRITICALNVD 9.89.8—Elevated

9.8

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

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 96.3%
KEV: Not listed

Published

April 14, 2026

Last Modified

April 22, 2026

Advisory Details (2)

Auto-updated May 12, 2026

No patch confirmed yet.

generic

GitHub - samu-delucas/CVE-2026-39808: PoC for Unauthenticated RCE in FortiSandbox via CVE-2026-39808 · GitHub

https://github.com/samu-delucas/CVE-2026-39808

generic

PSIRT | FortiGuard Labs

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

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-78OS Command Injection

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 11:22 UTCepss_batch
2026-05-20 11:22 UTCepss_batch
2026-05-20 06:57 UTCEG score recompute
2026-05-20 06:57 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Nucleihttp/cves/2026/CVE-2026-39808.yaml
First seen Jan 1, 2026
Fortinet FortiSandbox - Command Injection
Open source ↗

Frequently asked(5)

What is CVE-2026-39808?

CVE-2026-39808 is a critical vulnerability published on April 14, 2026. 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>

When was CVE-2026-39808 disclosed?

CVE-2026-39808 was first published in the National Vulnerability Database on April 14, 2026, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-39808 actively exploited?

CVE-2026-39808 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 96.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

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

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

How do I remediate CVE-2026-39808?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39808, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-39808

📅 Published

🔄 Last Modified

📋 Advisory Details (2)