Security Digest · Vulnerability record · Known exploited
CVE-2026-25108: Soliton Systems K.K FileZen OS Command Injection Vulnerability
Exploited in the wild (CISA KEV). FileZen contains an OS command injection vulnerability.
CISA KEV · added 2026-02-24 CVSS 8.7 High EPSS 5.2% · p92
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run Soliton Systems K.K FileZen. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-02-24, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-03-17; treat that as the outer limit, not the target.
- EPSS 5.2%, percentile 92: FIRST’s model estimates a 5.2% chance of exploitation activity in the next 30 days, higher than 92% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
What it is
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.
CISA’s summary
Soliton Systems K.K FileZen contains an OS command injection vulnerability when an user logs-in to the affected product and sends a specially crafted HTTP request.
Weakness type: CWE-78.
Product: Soliton Systems K.K FileZen · Assigned by: jpcert · Published: 2026-02-13
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Soliton Systems K.K. | FileZen | V5.0.0 to V5.0.10 |
| Soliton Systems K.K. | FileZen | V4.2.1 to V4.2.8 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| jpcert | 3.0 | 8.8 High | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| jpcert | 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Attack requirements: none
- Privileges required: low (any account)
- User interaction: none
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2026-02-24; federal due date 2026-03-17. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active, automatable no, technical impact total.
- FIRST EPSS (model of 2026-10-21): 5.25% probability of exploitation activity in the next 30 days; percentile 92.
Timeline
- — CVE record published by jpcert
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CVE record last updated
- — CISA remediation deadline for US federal agencies
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
Vulnerability records
- CVE.org record CVE-2026-25108 cve.org
- NVD entry CVE-2026-25108 nvd.nist.gov
Government
Other references from the CVE record and advisory
- soliton.co.jp soliton.co.jp
All exploited Soliton Systems K.K vulnerabilities · Today’s Security Digest