Soliton FileZen OS Command Injection Vulnerability Security Advisory (CVE-2026-25108)
Executive & SecOps Summary
SECOPS ASSESSMENTSoliton FileZen deployments with the Antivirus Check Option enabled
An authenticated attacker can execute arbitrary OS commands with elevated privileges by sending a specially crafted HTTP request
Immediately apply the official vendor security patches, or temporarily disable the Antivirus Check Option and restrict network access
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Apply the latest official security patch provided by Soliton. Use the following commands to verify the system version and patch status on the FileZen CLI.
# Access FileZen CLI to verify current version and applied patches
show version
show patch2. Temporary Workaround & Hardening Configuration
If patching cannot be applied immediately, disable the Antivirus Check Option or configure a Web Application Firewall (WAF) to block malicious payloads.
# Example Nginx reverse proxy configuration to block shell metacharacters
server {
listen 80;
server_name filezen.local;
location / {
if ($request_uri ~* '[\;\|\&\`\$\(\)]') {
return 403 'Suspicious request blocked';
}
proxy_pass http://filezen_backend;
}
}3. Log Audit & IoC Verification Commands
Inspect system and web server logs for signs of command injection attempts.
# Search web access logs for shell metacharacters in requests
grep -Ei '(\;|\||\&|\`|\$\()' /var/log/nginx/access.log /var/log/httpd/access_log
# Monitor active processes for suspicious shell executions
ps auxf | grep -E 'sh|bash|cmd' | grep -v grepBlock Exploits Instantly with Managed Virtual Patching Rules
Can't patch production immediately? Deploy managed WAF rules at the edge to intercept RCE, SQLi, and deserialization payloads before they hit your origin server.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2026-25108) is an OS Command Injection (CWE-78) vulnerability in Soliton FileZen. The root cause lies in the 'Antivirus Check Option' feature. When this option is enabled, the system processes uploaded files through an internal antivirus engine. Due to insufficient sanitization and improper escaping of user-supplied inputs (such as filenames or associated parameters) before passing them to system shell commands, an attacker can inject shell metacharacters (e.g., ;, |, &) to alter the command execution flow.
2. Exploitation Mechanics & Attack Scenario
To exploit this vulnerability, an attacker must first authenticate to the FileZen system with low privileges (CVSS PR:L). Once logged in, the attacker initiates a file upload or download request that triggers the antivirus scanning process. By embedding malicious OS commands within the filename or HTTP request parameters, the attacker forces the backend antivirus daemon to execute the injected commands alongside the legitimate scanning command. Since this vulnerability is listed in the CISA KEV catalog, active exploitation in the wild has been confirmed, making it a critical threat.
3. Infrastructure & Business Impact
With a CVSS 3.1 score of 8.8 (High), the impact of successful exploitation is severe. An attacker can gain complete control over the FileZen server, leading to total compromise of confidentiality, integrity, and availability. This allows unauthorized access to sensitive business files, potential data exfiltration, and lateral movement within the internal network. The high EPSS score (0.0525) and CISA KEV status emphasize the urgency of immediate remediation.
Official Vendor Advisories & References
FileZen contains an OS command injection vulnerability. When FileZen Antivirus Check Option is enabled, a logged-in user may send a specially crafted HTTP request to execute an arbitrary OS command.
Frequently Asked SecOps Questions (CVE-2026-25108)
FAQQ1. How critical is CVE-2026-25108 and is it actively exploited in the wild?
CVE-2026-25108 is rated CVSS 8.8 (HIGH) with a 30-day EPSS exploitation probability of 5.3%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2026-25108?
Primary impacted vendors include soliton across filezen. Scope summary: Soliton FileZen (all versions where 'Antivirus Check Option' is enabled)
Q3. What temporary mitigations or workarounds exist for CVE-2026-25108 before patching?
[Mitigation] Immediately apply the official vendor security patches, or temporarily disable the Antivirus Check Option and restrict network access Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2026-25108
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