CVE-2026-25108: Soliton Systems K.K FileZen OS Command Injection Vulnerability

Patch now

HIGH 8.8EXPLOITEDUPGRADE

CVE-2026-25108 is a high-severity flaw (CVSS 8.8) affecting filezen, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
EPSS top 7%: very likely to be exploited
Exploited in the wild (CISA KEV)

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	5.2% (top 7%)
CISA exploited list	Yes, fix due 2026-03-17
Weakness	CWE-78
Published	2026-02-13
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: soliton

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-13 04:15 UTCPublished CVE record published
2026-02-24Exploited Added to the CISA Known Exploited Vulnerabilities list
2026-03-17Deadline CISA due date for US federal agencies to patch
2026-06-17 10:24 UTCUpdated Record last modified

soliton filezen UPGRADE

Affected: >= 4.2.1 and < 5.0.11

Fixed in: 5.0.11

Safe to downgrade to: a release before 4.2.1

1. Check installed version

apt-cache policy filezen || rpm -q filezen || filezen --version

2. UPGRADE to 5.0.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade filezen

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade filezen

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.2.1 (Debian / Ubuntu)

apt-cache madison filezen sudo apt install filezen=<VERSION_BEFORE_4.2.1> sudo apt-mark hold filezen

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list filezen sudo dnf downgrade filezen-<VERSION_BEFORE_4.2.1> sudo dnf versionlock add filezen

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora 46 · complytime-providers · FIXED · 0.3.0-2.fc46 · FEDORA-2026-7c372be466 · source

sudo dnf upgrade --advisory=FEDORA-2026-7c372be466

Fedora ELN · cldr-emoji-annotation · FIXED · 49-1.eln159 · FEDORA-2026-26a40365f1 · source

sudo dnf upgrade --advisory=FEDORA-2026-26a40365f1

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-25108?

filezen: upgrade to 5.0.11. Exact commands for each OS are on this page.

Is CVE-2026-25108 being exploited?

Yes. CVE-2026-25108 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2026-25108 affect?

CVE-2026-25108 affects filezen. Severity is high (CVSS 8.8). 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.

How urgent is CVE-2026-25108?

Priority 79/100. High severity; EPSS top 7%: very likely to be exploited; Exploited in the wild (CISA KEV)

References

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