CVE-2026-25089Known exploitationPublic exploitNetwork attack vector

Unauthenticated command execution via start VNC JSON input

Published Jun 9, 2026 · Updated Jun 9, 2026

OS command injection in Fortinet FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS allows remote attackers to execute commands. The start VNC feature retains attacker-controlled JSON input and later incorporates it into an operating-system command without neutralizing command separators. No authentication or user interaction is required across FortiSandbox 4.2.1 through 4.2.8, 4.4.0 through 4.4.8, and 5.0.0 through 5.0.5, plus both hosted products 5.0.4 through 5.0.5.

CVSS severity9.8
Critical
EPSS probability76.11%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Fortinet FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS allows remote attackers to execute commands. The start VNC feature retains attacker-controlled JSON input and later incorporates it into an operating-system command without neutralizing command separators. No authentication or user interaction is required across FortiSandbox 4.2.1 through 4.2.8, 4.4.0 through 4.4.8, and 5.0.0 through 5.0.5, plus both hosted products 5.0.4 through 5.0.5.

The record

CVE
CVE-2026-25089
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
Fortinet
Product
FortiSandbox Cloud
Classifications
CWE-78, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 2026Record updatedLatest update available in the CVE record.
  3. Jul 16, 2026Exploitation reportedCISA Known Exploited Vulnerabilities catalog listing

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.0.4 <=5.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fortinet · FortiSandbox Cloudversion=5.0.4 <=5.0.5
Fortinet · FortiSandboxversion=4.2.1 <=4.2.8; version=4.4.0 <=4.4.8; version=5.0.0 <=5.0.5
Fortinet · FortiSandbox PaaSversion=5.0.4 <=5.0.5

Published CVSS scores

9.8FortinetCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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