CVE-2026-25836
📋 TL;DR
This CVE describes an OS command injection vulnerability in Fortinet FortiSandbox Cloud 5.0.4 that allows privileged attackers with super-admin profile and CLI access to execute arbitrary commands via crafted HTTP requests. This could lead to complete system compromise of affected FortiSandbox Cloud instances. Only organizations running the specific vulnerable version are affected.
💻 Affected Systems
- Fortinet FortiSandbox Cloud
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the FortiSandbox Cloud instance, allowing attacker to execute arbitrary commands with system privileges, potentially leading to lateral movement within the network, data exfiltration, or deployment of persistent malware.
Likely Case
Privileged attacker with existing access escalates privileges to execute arbitrary commands on the FortiSandbox Cloud system, potentially compromising the security appliance itself.
If Mitigated
Attack is prevented due to proper access controls, network segmentation, and lack of privileged attacker presence in the environment.
🎯 Exploit Status
Exploitation requires authenticated access with super-admin privileges and CLI access. The vulnerability is in the web interface handling of HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.0.5 or later
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-26-096
Restart Required: Yes
Instructions:
1. Log into FortiSandbox Cloud management interface. 2. Navigate to System > Dashboard. 3. Check for available firmware updates. 4. Download and install version 5.0.5 or later. 5. Reboot the appliance after installation completes.
🔧 Temporary Workarounds
Restrict CLI Access
allLimit CLI access to only necessary administrative personnel and implement strict access controls.
Network Segmentation
allIsolate FortiSandbox Cloud management interface from general network access.
🧯 If You Can't Patch
- Implement strict access controls to limit who has super-admin privileges
- Monitor for unusual CLI activity and HTTP requests to the management interface
🔍 How to Verify
Check if Vulnerable:
Check FortiSandbox Cloud version via CLI: 'get system status' or via web interface: System > Dashboard > System InformationCheck Version:
get system status | grep VersionVerify Fix Applied:
Verify version is 5.0.5 or later using same commands. Test that crafted HTTP requests no longer execute arbitrary commands.📡 Detection & Monitoring
Log Indicators:
- Unusual CLI command execution patterns
- HTTP requests with shell metacharacters or command injection attempts in parameters
- Multiple failed authentication attempts followed by successful super-admin login
Network Indicators:
- Unusual outbound connections from FortiSandbox Cloud appliance
- HTTP requests to management interface containing shell metacharacters
SIEM Query:
source="fortisandbox" AND (event_type="cli_command" AND command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*)")