CVE-2026-25089
Fortinet FortiSandbox OS Command Injection Vulnerability
Fortinet FortiSandbox
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
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 16 July 2026. US federal agencies were required to remediate it by 19 July 2026.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 73.6%, which is higher than 99.4% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Frequently asked questions
Is CVE-2026-25089 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2026-25089.
What does CVE-2026-25089 affect?
CVE-2026-25089 affects Fortinet FortiSandbox. 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
How severe is CVE-2026-25089?
CVE-2026-25089 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 73.6%, higher than 99.4% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 19 July 2026.
How should organisations respond to CVE-2026-25089?
Apply the vendor patch for Fortinet FortiSandbox as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.