{"id":"CVE-2026-39808","published":"2026-04-14T16:16:44Z","modified":"2026-10-26T21:10:00Z","title":"Fortinet FortiSandbox OS Command Injection Vulnerability","vendor":"Fortinet","product":"FortiSandbox","tier":"core","eol":null,"description":{"text":"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>","provenance":"source","from":"NVD"},"summary":{"text":"A command injection flaw (CWE: improper neutralization of special elements used in an OS command) exists in Fortinet FortiSandbox's handling of OS commands, affecting versions 4.4.0 through 4.4.8. An attacker who can reach the device over the network, without authentication or any user interaction, can execute unauthorized code or commands on it.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T07:53:58Z"},"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.93189,"percentile":0.99834,"date":"2026-10-31","provenance":"source"},"kev":{"dateAdded":"2026-07-16","dueDate":"2026-07-19","ransomware":false,"requiredAction":"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.","notes":"https://fortiguard.fortinet.com/psirt/FG-IR-26-100 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-39808","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-06-09","exploitedFirstSeen":"2026-06-12","ransomware":false,"evidence":[{"url":"https://previdian.com/CVE-2026-39808","date":"2026-06-12"},{"url":"https://x.com/DefusedCyber/status/2066575288503255274","date":"2026-06-15"},{"url":"https://www.crowdsec.net/vulntracking-report/cve-2026-39808-fortinet-fortisandbox-command-injection","date":"2026-06-29"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-07-09&host_type=src&vulnerability=cve-2026-39808","date":"2026-07-09"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-07-10&host_type=src&vulnerability=cve-2026-39808","date":"2026-07-10"},{"url":"https://www.recordedfuture.com/blog/june-2026-cve-landscape","date":"2026-07-10"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-07-16"},{"url":"https://www.recordedfuture.com/blog/july-2026-cve-landscape","date":"2026-08-07"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-09-17&host_type=src&vulnerability=cve-2026-39808","date":"2026-09-17"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-09-21&host_type=src&vulnerability=cve-2026-39808","date":"2026-09-21"}],"evidenceTotal":26,"provenance":"source"},"exploited":true,"otx":null,"cwes":[{"id":"CWE-78","name":"Improper Neutralization of Special Elements used in an OS Command"}],"references":[{"url":"https://fortiguard.fortinet.com/psirt/FG-IR-26-100","tags":["Vendor Advisory"]},{"url":"https://github.com/samu-delucas/CVE-2026-39808","tags":["Exploit","Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39808","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Network-reachable web interface command injection","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"os command injection","start":70,"end":90}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Attacker executes arbitrary OS commands","mappingType":"primary_impact","evidence":[{"from":"description","quote":"execute unauthorized code or commands","start":174,"end":211}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[{"id":"SRC-4cf3172d190519e868ee","title":"Blog | Arctic Wolf","publisher":"arcticwolf.com","url":"https://arcticwolf.com/resources/blog/","date":null,"mentions":[{"quote":"CVE-2026-39808: Critical Fortinet FortiSandbox OS Command Injection Vulnerability","start":10172,"end":10253}]}],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-22338","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-22338","exploited":true,"exploitedSince":"2026-07-16","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":7,"skipped":0,"earliest":"2026-04-15","earliestUrl":"https://github.com/samu-delucas/CVE-2026-39808","repos":[{"name":"ynsmroztas/FortiSandbox-RCE-Exploit-CVE-2026-39808","url":"https://github.com/ynsmroztas/FortiSandbox-RCE-Exploit-CVE-2026-39808","stars":26,"created":"2026-04-21"},{"name":"samu-delucas/CVE-2026-39808","url":"https://github.com/samu-delucas/CVE-2026-39808","stars":9,"created":"2026-04-15"},{"name":"0xBlackash/CVE-2026-39808","url":"https://github.com/0xBlackash/CVE-2026-39808","stars":2,"created":"2026-04-18"},{"name":"gotr00t0day/CVE-2026-39808","url":"https://github.com/gotr00t0day/CVE-2026-39808","stars":2,"created":"2026-10-03"},{"name":"HORKimhab/CVE-2026-39808","url":"https://github.com/HORKimhab/CVE-2026-39808","stars":0,"created":"2026-06-17"}]},"nuclei":[{"id":"CVE-2026-39808","name":"Fortinet FortiSandbox - Command Injection","severity":"critical","path":"http/cves/2026/CVE-2026-39808.yaml","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-39808.yaml"}],"first":{"date":"2026-04-15","source":"PoC-in-GitHub","url":"https://github.com/samu-delucas/CVE-2026-39808"},"provenance":"source"},"exploitRefs":["https://github.com/samu-delucas/CVE-2026-39808"],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1059"],"provenance":"ai"}],"timeline":[{"date":"2026-04-14","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39808","provenance":"source"},{"date":"2026-04-15","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/samu-delucas/CVE-2026-39808","provenance":"source"},{"date":"2026-06-12","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://previdian.com/CVE-2026-39808","provenance":"source"},{"date":"2026-07-16","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2026-07-16","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-22338","provenance":"source"}],"speed":{"daysToPublicExploit":1,"firstExploitFrom":"PoC-in-GitHub","daysToKev":93},"priority":{"score":75.7,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":5.0,"detail":"added 145 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.97,"detail":"percentile 0.9983"},{"name":"Named in threat reports","points":3.87,"detail":"1 report"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD reference tagged Exploit; 7 PoC-in-GitHub repos; 1 nuclei template"},{"name":"Mentioned in OTX pulses","points":0.0,"detail":"0 pulses"},{"name":"CVSS severity","points":6.86,"detail":"base score 9.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-fortinet-fortisandbox-cwe-78"}}