# CVE-2026-25108: Soliton Systems FileZen OS command injection in Antivirus Check Option

Source: https://junglewise.ai/threats/cve-2026-25108-soliton-systems-filezen-os-command-injection-in-antivirus-check  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-24. Updated: 2026-05-15  
License: CC BY 4.0 with a link back

CVE-2026-25108 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2026-02-24

Soliton FileZen, a secure file transfer and sharing appliance, contains a critical security flaw that allows an attacker to take control of the system. By sending a specifically formatted web request, a logged-in user can execute unauthorized commands on the underlying operating system. This could lead to the theft of sensitive files, service disruption, or a total compromise of the appliance. This vulnerability is currently being exploited in the wild.

## Quick answers

**Is CVE-2026-25108 exploited in the wild?** Yes. CVE-2026-25108 is known to be exploited in the wild, first recorded on 24 February 2026. Treat it as urgent.

**How severe is CVE-2026-25108?** Critical severity, with a CVSS score of 8.8, published 24 February 2026.

**Which products and versions are affected?** Soliton Systems K.K. FileZen 4.2.1 to 5.0.10.

**Is there a fix for CVE-2026-25108?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-25108 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-25108?** Check whether you run Soliton Systems K.K Filezen. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An OS command injection vulnerability (CWE-78) exists in Soliton FileZen within the Antivirus Check Option component. The flaw is triggered when the system fails to properly neutralize special elements in an HTTP request, allowing a remote authenticated user with low privileges to execute arbitrary commands on the host operating system. The attack vector is network-based and does not require user interaction, though it does require valid login credentials. This vulnerability has been added to the CISA Known Exploited Vulnerabilities (KEV) catalog, indicating active exploitation. Users should update to version 5.0.11 or later.

## Affected products

- Soliton Systems K.K. FileZen 4.2.1 to 5.0.10

## Timeline

- 2026-02-12: disclosed
- 2026-02-24: kev added: Added to CISA Known Exploited Vulnerabilities catalog.