CVE-2026-39808 (GCVE-0-2026-39808)

Vulnerability from cvelistv5 – Published: 2026-04-14 15:38 – Updated: 2026-07-17 03:56
VLAI CISA Shadowserver KEVIntel
Summary
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>
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-78 - Execute unauthorized code or commands
Assigner
Impacted products
Vendor Product Version
Fortinet FortiSandbox Affected: 4.4.0 , ≤ 4.4.8 (semver)
    cpe:2.3:a:fortinet:fortisandbox:4.4.8:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.7:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.6:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.5:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.4:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.3:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.2:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.0:*:*:*:*:*:*:*
Create a notification for this product.
Fortinet FortiSandbox PaaS Affected: 23.4.4374
Affected: 23.4.4350
Affected: 23.3.4329
Affected: 23.1.4245
Affected: 22.2.4151
Affected: 22.2.4134
Affected: 22.1.4113
Affected: 21.4.4072
Affected: 21.3.4055
    cpe:2.3:a:fortinet:fortisandboxpaas:23.4.4374:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:23.4.4350:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:23.3.4329:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:23.1.4245:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:22.2.4151:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:22.2.4134:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:22.1.4113:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:21.4.4072:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:21.3.4055:*:*:*:*:*:*:*
Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2026-39808

Status: Confirmed

Status Updated: 2026-07-16 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2026-07-16
Asserted: 2026-07-16

Scope
Notes: Fortinet FortiSandbox OS Command Injection Vulnerability | Affected: Fortinet / FortiSandbox | 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: 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. | Due date: 2026-07-19 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev


Details
Cwes CWE-78
Feed CISA Known Exploited Vulnerabilities Catalog
Product FortiSandbox
Due Date 2026-07-19
Date Added 2026-07-16
Vendorproject Fortinet
Vulnerabilityname Fortinet FortiSandbox OS Command Injection Vulnerability
Knownransomwarecampaignuse Unknown

References

Created: 2026-07-16 18:00 UTC | Updated: 2026-07-16 18:00 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2026-39808

Status: Confirmed

Status Updated: 2026-07-10 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2026-07-08
Asserted: 2026-07-08
Last Seen: 2026-07-10

Scope
Asset Exposure: ['internet-facing']
Notes: IoT: no | In CISA KEV: no | Honeypot connections on 2026-07-10: 1

Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver


Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class None
7D Avg 0
Vendor
30D Avg 0
90D Avg 0
Product
Cisa Kev no
Connections 1
Observation Date 2026-07-10
Vulnerability Class None
Vulnerability Score None
Vulnerability Severity None

References

Created: 2026-07-11 01:00 UTC | Updated: 2026-07-12 01:01 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2026-39808

Status: Confirmed

Status Updated: 2026-06-12 13:59 UTC

Exploited: Yes


Timestamps
First Seen: 2026-06-12
Asserted: 2026-06-12

Scope
Notes: KEVIntel entry: A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 4.4.0 through... | Affected: Fortinet / FortiSandbox, FortiSandbox PaaS | CVSS: 9.8 (CRITICAL) | EPSS: 0.66168 | Used in malware: unknown | Not yet in CISA KEV: True

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel


Details
Feed KEVIntel (kevintel.com)
Title A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 4.4.0 through...
Vendor Fortinet
Product FortiSandbox, FortiSandbox PaaS
Added Date 2026-06-12T13:59:12.791Z
Cvss Score 9.8
Epss Score 0.66168
Cvss Severity CRITICAL
Epss Percentile 0.9918
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True

References

Created: 2026-06-19 12:42 UTC | Updated: 2026-06-19 12:42 UTC
Show details on NVD website

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    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-39808\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"active\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-16T17:45:11.106860Z\"}}}, {\"other\": {\"type\": \"kev\", \"content\": {\"dateAdded\": \"2026-07-16\", \"reference\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39808\"}}}], \"references\": [{\"url\": \"https://github.com/samu-delucas/CVE-2026-39808\", \"tags\": [\"exploit\"]}, {\"url\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39808\", \"tags\": [\"government-resource\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-14T16:37:38.704Z\"}, \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-07-16T00:00:00.000Z\", \"value\": \"CVE-2026-39808 added to CISA KEV\"}]}], \"cna\": {\"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 9.1, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:fortinet:fortisandbox:4.4.8:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandbox:4.4.7:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandbox:4.4.6:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandbox:4.4.5:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandbox:4.4.4:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandbox:4.4.3:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandbox:4.4.2:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandbox:4.4.1:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandbox:4.4.0:*:*:*:*:*:*:*\"], \"vendor\": \"Fortinet\", \"product\": \"FortiSandbox\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.4.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.4.8\"}], \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:2.3:a:fortinet:fortisandboxpaas:23.4.4374:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandboxpaas:23.4.4350:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandboxpaas:23.3.4329:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandboxpaas:23.1.4245:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandboxpaas:22.2.4151:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandboxpaas:22.2.4134:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandboxpaas:22.1.4113:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandboxpaas:21.4.4072:*:*:*:*:*:*:*\", \"cpe:2.3:a:fortinet:fortisandboxpaas:21.3.4055:*:*:*:*:*:*:*\"], \"vendor\": \"Fortinet\", \"product\": \"FortiSandbox PaaS\", \"versions\": [{\"status\": \"affected\", \"version\": \"23.4.4374\"}, {\"status\": \"affected\", \"version\": \"23.4.4350\"}, {\"status\": \"affected\", \"version\": \"23.3.4329\"}, {\"status\": \"affected\", \"version\": \"23.1.4245\"}, {\"status\": \"affected\", \"version\": \"22.2.4151\"}, {\"status\": \"affected\", \"version\": \"22.2.4134\"}, {\"status\": \"affected\", \"version\": \"22.1.4113\"}, {\"status\": \"affected\", \"version\": \"21.4.4072\"}, {\"status\": \"affected\", \"version\": \"21.3.4055\"}], \"defaultStatus\": \"unaffected\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Upgrade to FortiSandbox version 4.4.9 or above\\nUpgrade to FortiSandbox PaaS version 5.0.2 or above\"}], \"references\": [{\"url\": \"https://fortiguard.fortinet.com/psirt/FG-IR-26-100\", \"name\": \"https://fortiguard.fortinet.com/psirt/FG-IR-26-100\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A improper neutralization of special elements used in an os command (\u0027os command injection\u0027) vulnerability in Fortinet FortiSandbox 4.4.0 through 4.4.8 may allow attacker to execute unauthorized code or commands via \u003cinsert attack vector here\u003e\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-78\", \"description\": \"Execute unauthorized code or commands\"}]}], \"providerMetadata\": {\"orgId\": \"6abe59d8-c742-4dff-8ce8-9b0ca1073da8\", \"shortName\": \"fortinet\", \"dateUpdated\": \"2026-04-14T15:38:02.089Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-39808\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-17T03:56:21.793Z\", \"dateReserved\": \"2026-04-07T15:24:03.838Z\", \"assignerOrgId\": \"6abe59d8-c742-4dff-8ce8-9b0ca1073da8\", \"datePublished\": \"2026-04-14T15:38:02.089Z\", \"assignerShortName\": \"fortinet\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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