CVE-2026-25108: Soliton Systems K.K FileZen OS Command Injection Vulnerability

Vulnerability summary

CVE-2026-25108 is a high (CVSS 8.8) OS Command Injection vulnerability in Soliton Systems K.K FileZen. It is known to be exploited: CISA and CIRCL list it, first on 24-02-2026. EPSS estimates a 5.25% chance of exploitation in the next 30 days, higher than 92.4% of scored vulnerabilities.

Timeline

1. 13-02-2026
   PublishedVulnerability first disclosed.
2. 24-02-2026
   Added to CISA KEVSoliton Systems K.K FileZen OS Command Injection Vulnerability
3. 26-02-2026
   Added to CIRCL KEVAdded to the CIRCL known exploited vulnerabilities catalog.
4. 26-02-2026
   Last modifiedVulnerability information updated.
5. 17-03-2026
   CISA remediation dueApply mitigations per vendor instructions.

Description

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.

• CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.