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CVE-2026-25108

From Exploited flaws, HARD’s guide to the flaws being used in attacks · Checked
This article is about a flaw in Soliton Systems K.K FileZen. For every flaw being used in attacks, see Exploited flaws.

CVE-2026-25108 is a security flaw in Soliton Systems K.K FileZen. Attackers can run commands on Soliton Systems K.K FileZen. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 24 Feb 2026.[1]

Soliton Systems K.K FileZen is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. Soliton Systems K.K has published a fix or advice.

Description

CISA calls it an OS command injection in Soliton Systems K.K FileZen. In its words: “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.”[1]

The underlying weakness is OS command injection (CWE-78), in MITRE’s list of common software weaknesses.[2]

It scores 8.8 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by NVD using CVSS 3.1.[2]

Affected versions

NVD’s record doesn’t list version ranges for it; Soliton Systems K.K’s advisory has them[3]. CISA names the product as Soliton Systems K.K FileZen.

Most families won’t have Soliton Systems K.K FileZen; it’s for whoever looks after IT at work.

Exploitation

CISA added it to its catalog of known exploited vulnerabilities on 24 Feb 2026, 11 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 17 Mar 2026 to fix it.[1]

FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 5%. That’s in the top 8% of the flaws it scores.[4]

CISA assesses it as not automatable: each attack takes some work.

CISA doesn’t say who was attacked, or how.

Fix

Soliton Systems K.K has published a fix or advice.[3] CISA’s 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.”[1]

  1. Check whether you use it.Soliton Systems K.K FileZen is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
  2. Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 17 Mar 2026 to fix it.
  3. If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.

You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.

Timeline

DateEvent
The flaw is made public in the National Vulnerability Database, with a severity score of 8.8.[2]
CISA adds it to its catalog of flaws known to be used in attacks.[1]
CISA’s deadline for US government agencies to fix it.[1]
FIRST puts the odds of it being used in attacks in the next 30 days at 5%.[4]

See also

Other OS command injection flaws

  • CVE-2026-110447, Collabora Online – Built-in CODE Server: online – built-in CODE server OS command injection ·
  • CVE-2026-106931, EG Secure Solutions SiteGuard Server Edition: OS command injection ·
  • CVE-2026-83549, SonicWall SMA1000 Appliances: OS command injection ·
  • CVE-2026-49869, Kestra OSS: OSS OS command injection ·
  • CVE-2026-73570, Synacor Zimbra Collaboration Suite (ZCS): OS command injection ·

References

  1. ^ Cybersecurity and Infrastructure Security Agency. “Soliton Systems K.K FileZen OS Command Injection Vulnerability”. Known Exploited Vulnerabilities Catalog, added 24 Feb 2026.
  2. ^ National Institute of Standards and Technology. “CVE-2026-25108 Detail”. National Vulnerability Database, published 13 Feb 2026.
  3. ^ Soliton Systems K.K. Advisories and fixes: jvn.jp, soliton.co.jp.
  4. ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.052, percentile 92.5, 31 Oct 2026.
  5. CVE Program. “CVE-2026-25108”. The official CVE record.

This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.