Actively Exploited — CISA KEV

CVE-2026-25108: Soliton Systems K.K FileZen High-Severity Vulnerability

Severity: High | CVSS 3.1: 8.8 | Published: 2026-02-13 | KEV Added: 2026-02-24

What is CVE-2026-25108?

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.

Technical Analysis

Weakness Classification

This vulnerability is classified as CWE-78 — OS Command Injection. The application passes untrusted input to an operating system shell command, enabling an attacker to execute arbitrary OS commands with the application's privileges.

Attack Vector Breakdown

  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality: High
  • Integrity: High
  • Availability: High

Impact Analysis

This vulnerability is exploitable over the network, meaning any system reachable via the internet or internal network is potentially at risk without physical access. The attack complexity is low, meaning exploitation does not depend on specialized conditions or race windows. Successful exploitation can result in full confidentiality breach (complete data disclosure), complete integrity compromise (data modification or code execution), total availability loss (denial of service). The application passes untrusted input to an operating system shell command, enabling an attacker to execute arbitrary OS commands with the application's privileges.

Exploitation Probability (EPSS): 8.4% chance of exploitation in the next 30 days (92th percentile). While the base probability may appear low, inclusion in CISA KEV confirms real-world exploitation is already occurring.

Is CVE-2026-25108 being exploited?

Yes. CVE-2026-25108 is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, restricted to CVEs with confirmed active exploitation in the wild. CISA added this vulnerability on 2026-02-24. Inclusion in KEV triggers the patching mandate under BOD 22-01 for U.S. federal civilian agencies, with a remediation deadline of 2026-03-17.

How to fix CVE-2026-25108

Apply the security update issued by Soliton Systems K.K for FileZen. If an immediate patch is not possible, consult the vendor advisory for mitigation guidance, restrict network exposure of the affected service, and monitor logs for indicators of exploitation. CISA's Known Exploited Vulnerabilities catalog requires U.S. federal agencies to remediate this vulnerability by the due date shown below under Binding Operational Directive 22-01. Private organizations should treat KEV entries as priority-one patches because active exploitation has been confirmed in the wild.

Related Vulnerabilities

Other actively exploited vulnerabilities sharing the same weakness pattern (CWE-78 — OS Command Injection):

  • CVE-2026-1731 (Critical 9.8) [same CWE] — BeyondTrust Remote Support (RS) and certain older versions of Privileged…
  • CVE-2025-11953 (Critical 9.8) [same CWE] — The Metro Development Server, which is opened by the React Native Community…
  • CVE-2025-64328 (High 7.2) [same CWE] — FreePBX Endpoint Manager is a module for managing telephony endpoints in…
  • CVE-2025-66644 (High 7.2) [same CWE] — Array Networks ArrayOS AG before 9.4.5.9 allows command injection, as…
  • CVE-2025-58034 (High 7.2) [same CWE] — An Improper Neutralization of Special Elements used in an OS Command ('OS…

Frequently asked questions

Is CVE-2026-25108 critical?

CVE-2026-25108 has a CVSS 3.1 base score of 8.8 — High severity. It should be treated as a priority patch, especially given the active exploitation confirmed by CISA.

Is CVE-2026-25108 being actively exploited?

Yes — CISA added CVE-2026-25108 to the Known Exploited Vulnerabilities catalog on 2026-02-24. Inclusion in KEV means CISA has confirmed in-the-wild exploitation.

How do I patch CVE-2026-25108?

Apply the security update from Soliton Systems K.K for FileZen. Federal agencies must remediate by 2026-03-17 under BOD 22-01.

What type of vulnerability is CVE-2026-25108?

CVE-2026-25108 is classified under CWE-78 (OS Command Injection). The application passes untrusted input to an operating system shell command, enabling an attacker to execute arbitrary OS commands with the application's privileges.

What is the CVSS score for CVE-2026-25108?

CVE-2026-25108 has a CVSS 3.1 base score of 8.8, classifying it as High severity. The attack vector is Network, attack complexity is Low, and non-zero privileges are required.