CVE-2026-25089: FortiSandbox second-order command injection

Quick Answer

CISA describes CVE-2026-25089 as unauthenticated HTTP command injection affecting FortiSandbox appliances, Cloud and PaaS. Identify the deployment model and who controls remediation before selecting an action. This notice does not verify a fixed appliance build or a completed provider rollout. Preserve submission, administrative and host evidence while confirming Fortinet's product-specific fix; an assumed service update cannot establish incident eradication.

Evidence check: CISA KEV catalog 2026.10.02 was checked on October 2. Vendor evidence and any unresolved fix limits are described below. Catalog inclusion confirms reported exploitation, not compromise of this deployment; verify current updates before production changes.

Context

Status At A Glance

Product scope	Fortinet — FortiSandbox
CVE	CVE-2026-25089
TechGeeks response tier	P0 — confirm an exact match and act now
CISA KEV added	2026-07-16
Vendor severity	Critical
CVSS	CVSS 3.1 base 9.8
Ransomware field	Unknown — this is not the same as No; CISA has not marked the field Known.
Forensic-triage field	Yes — CISA's record calls for forensic triage.
CWE	CWE-78
Federal remediation date	2026-07-19 — applies to covered federal agencies; other organizations should set a risk-based deadline.

What Happened

Fortinet FortiSandbox OS Command Injection Vulnerability. Fortinet FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS contain an OS command injection vulnerability that allows an unauthenticated attacker to execute unauthorized commands via specifically crafted HTTP requests. CISA's KEV listing confirms exploitation evidence, but it does not state how widespread the activity is or prove that any particular installation was compromised.

Affected Scope

Fortinet FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS contain an OS command injection vulnerability that allows an unauthenticated attacker to execute unauthorized commands via specifically crafted HTTP requests.

Match the exact edition, hardware or virtual platform, release, patch level, enabled feature, and management exposure. A product-family name alone is not enough to establish applicability.

Steps

What To Do Now

1. Confirm. Inventory every FortiSandbox asset and record its exact version, patch level, role, relevant configuration, and exposure.
2. Preserve. Save UTC timestamps, off-device authentication, firewall, proxy, DNS, endpoint, application, and SIEM evidence before logs rotate or a disruptive change removes context.
3. Contain. Restrict unnecessary internet and management-plane access using supported controls. Follow the live advisory: Open the live Fortinet advisory.
4. Remediate. Confirm whether FortiSandbox appliance, Cloud, or PaaS is in scope and apply the product-specific solution in FG-IR-26-141.
5. Validate. Verify the resulting version or patch level, service health, logging, expected access, an expected denial, and representative dependent workflows.
6. Escalate. If exposure overlapped the vulnerable period or evidence is suspicious, treat the system as a potential incident and follow vendor and incident-response recovery guidance.

Fixed Releases And Mitigation

Investigation And Recovery

CISA's KEV record marks this entry for forensic triage. Follow the linked CISA and vendor triage guidance and preserve relevant evidence before destructive remediation.

When an attacker may have gained administrative, root, SYSTEM, identity, management-plane, or code-execution access, patching alone is not an eradication claim. Preserve evidence, scope affected accounts and downstream systems, rotate exposed credentials or certificates when justified, and rebuild from a trusted source when vendor or incident-response guidance requires it.

Notes

Exploitation Evidence

Vendor statement: Fortinet's exact exploitation statement is not established here. CISA independently reports exploitation through its July 16 KEV addition; that does not confirm whether a particular appliance or tenant was affected.

CISA statement: CVE-2026-25089 was added to KEV on 2026-07-16. The ransomware field is Unknown, and the forensic-triage field is Yes. These are separate signals.

Validation And Boundaries

This notice does not prove that every product carrying the family name is affected, that exploitation is widespread, that a clean indicator search rules out compromise, or that a successful update restored trust. TechGeeks has not reproduced the exploit and does not replace the vendor advisory, asset inventory, vulnerability scanner, or incident-response process.

Related TechGeeks Resources

• TechGeeks Security Notice Center
• All Security Notices
• What to Do When a Device Hits CISA KEV
• Router CVE Exposure, Version, and Mitigation Checklist
• IoT Firmware Update and End-of-Support Checklist
• Live Protect and Runtime Vulnerability Shielding

References

• Fortinet advisory or support notice
• CISA guidance
• CISA guidance
• NVD CVE record
• CISA source

Wrap-Up

Record whether CVE-2026-25089 applies to your environment. If it does, assign an owner, preserve the change and investigation evidence, complete the vendor action, and document the validated result.

Correction policy: If a primary source changes affected versions, remediation, exploitation status, or recovery guidance, TechGeeks will update this page and its verification date.