RCE in Fortinet Fortisandbox

CVE-2026-25089

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…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.698 (99.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: .

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.

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-25089?
CVE-2026-25089 is a critical-severity vulnerability in Fortinet Fortisandbox, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-06-09.
How severe is CVE-2026-25089?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-25089 known to be exploited?
Yes. CVE-2026-25089 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-07-16), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.