OS Command Injection Vulnerability in Fortinet FortiSandbox
CVE-2026-25089

9.1CRITICAL

Key Information:

Vendor

Fortinet
Status
Fortisandbox
Fortisandbox Cloud
Fortisandbox Paas
Vendor
CVE Published:
9 June 2026

Badges

📈 Score: 542💰 Ransomware👾 Exploit Exists🟡 Public PoC🟣 EPSS 36%🦅 CISA Reported📰 News Worthy

What is CVE-2026-25089?

CVE-2026-25089 is a significant security vulnerability identified in Fortinet's FortiSandbox product, which is designed for advanced threat detection and analysis. The flaw arises from an improper neutralization of input elements in the context of OS command injection, allowing an attacker to execute unauthorized commands on the operating system. This vulnerability affects multiple versions of FortiSandbox, specifically versions 5.0.0 through 5.0.5, 4.4.0 through 4.4.8, and 4.2 across all versions, as well as FortiSandbox Cloud and PaaS versions 5.0.4 through 5.0.5.

Organizations utilizing FortiSandbox for malware analysis and threat detection could face severe risks associated with this vulnerability, as successful exploitation may enable unauthenticated attackers to run malicious commands that could compromise the integrity and availability of their systems and data.

Potential impact of CVE-2026-25089

  1. Unauthorized Access: The vulnerability enables attackers to execute arbitrary commands on affected systems, which can lead to unauthorized access to critical system functions and data. This may facilitate additional attacks or data breaches.

  2. System Compromise: By exploiting this vulnerability, malicious actors can gain control over FortiSandbox environments, leading to a complete compromise of those systems. Such control can result in further exploitation of network infrastructure or penetration into connected systems.

  3. Service Disruption: The ability to execute unauthorized commands may lead to the disruption of FortiSandbox services, affecting an organization’s capabilities in threat detection and response, ultimately diminishing security posture and leaving the organization vulnerable to ongoing threats.

CISA has reported CVE-2026-25089

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2026-25089 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace as recent news articles suggest the vulnerability is being used by ransomware groups.

The CISA's recommendation is: 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.

Affected Version(s)

FortiSandbox 5.0.0 <= 5.0.5

FortiSandbox 4.4.0 <= 4.4.8

FortiSandbox 4.2.1 <= 4.2.8

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-25089
Created by HORKimhab

News Articles

favicon imageThe Register

Attackers target critical FortiSandbox flaws as CISA issues patch order

Command injection vulns land on exploited list after researchers spot abuse attempts

4 days ago

favicon imagetheregister

Attackers target critical FortiSandbox flaws as CISA issues patch order

Command injection vulns land on exploited list after researchers spot abuse attempts

4 days ago

favicon imageInternational Business Times

US Cybersecurity Agency Sounds Alarm, Orders Immediate Action on Actively Exploited Fortinet Flaws

CISA has ordered US agencies to urgently patch actively exploited Fortinet vulnerabilities, warning the critical flaws could enable remote code execution...

4 days ago

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-141

EPSS Score

36% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🦅

    CISA Reported

  • 💰

    Used in Ransomware

  • 📰

    First article discovered by BleepingComputer

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.