Historical catalog analysis: CISA added this entry on February 24, 2026. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.
What the vulnerability is
CVE-2026-25108 is an OS command injection vulnerability (CWE-78) affecting Soliton Systems K.K FileZen. The flaw allows a user who has already logged into the system to send a specially crafted HTTP request that can result in the execution of arbitrary operating system commands.
Exposure and applicability
This vulnerability applies to organizations deploying Soliton Systems K.K FileZen. The attack vector requires an authenticated session; therefore, exposure is highest for environments with a large number of logged-in users or those where account compromise has already occurred. Because this vulnerability has been added to the CISA Known Exploited Vulnerabilities (KEV) catalog as of February 24, 2026, it is confirmed to be exploited in the wild, increasing the urgency for asset identification and remediation.
Remediation priorities
Based on the reported exploitability, we analyze the following prioritization for vulnerability management teams:
- Asset Identification: Immediately identify all instances of FileZen across the environment, including cloud-hosted versions.
- Vendor Mitigation Application: Apply the specific mitigations provided by Soliton Systems K.K.
- Service Evaluation: In cases where vendor mitigations are unavailable or cannot be applied to the current deployment, organizations should evaluate the discontinuation of the product to eliminate the exposure path.
- Cloud Governance: For cloud-based deployments, ensure alignment with BOD 22-01 guidance regarding the management of known exploited vulnerabilities.
How to validate remediation
Verification must move beyond a simple version check or the presence of a patch. To assure that the vulnerability has been mitigated, defenders should:
- Verify Mitigation Application: Confirm through configuration audits or vendor-provided tools that the specific mitigation steps were successfully executed on the host.
- Test Input Validation: In a controlled, authorized environment, verify that the system no longer processes specially crafted HTTP requests as OS commands.
- Review Access Logs: Analyze logs for unauthorized command execution attempts targeting the FileZen interface to ensure no persistence was established prior to remediation.
Limits and open questions
It remains unknown whether this vulnerability has been utilized in known ransomware campaigns. Additionally, while the attack requires authentication, the source does not specify if any particular privilege level is required beyond a standard user login. Residual risk persists if mitigations are applied but authenticated access controls (such as MFA) are weak, as the entry path relies on a logged-in session.
Source and editorial note
CVE-2026-25108: Soliton Systems K.K FileZen OS Command Injection Vulnerability · Source date: February 24, 2026 · Retrieved August 31, 2026.
Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.
Archive date: February 27, 2026. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: September 19, 2026 at 00:55 UTC.
Request a Vulnerability Assessment
Turn security intelligence into action.
Discuss your exposure, priorities, and the evidence needed to validate the outcome.
Request a security assessment ↗